diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bcb1d5f..2006edba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,8 @@ See [DocuSign Support Center](https://support.docusign.com/en/releasenotes/) for
 ### Changed
 - Added support for version v2.1-25.2.00.00 of the DocuSign ESignature API.
 - Updated the SDK release version.
+- Modernized constructor classes in Api, Client and Model files (including Configuration.php file) by adding `?array $data = null` to address deprecated warnings in PHP.
+- Added return types (`bool`, `mixed`, and `void`) to several functions in model files to improve type safety and compatibility with modern PHP versions.
 
 ## [v8.1.0] - eSignature API v2.1-25.1.00.02 - 2025-05-05
 ### Changed
diff --git a/src/Api/CommentsApi.php b/src/Api/CommentsApi.php
index 67ede438..fa62db97 100644
--- a/src/Api/CommentsApi.php
+++ b/src/Api/CommentsApi.php
@@ -113,7 +113,7 @@ public function getApiClient()
      *
      * @return CommentsApi
      */
-    public function setApiClient(\DocuSign\eSign\Client\ApiClient $apiClient)
+    public function setApiClient(?\DocuSign\eSign\Client\ApiClient $apiClient)
     {
         $this->apiClient = $apiClient;
         return $this;
diff --git a/src/Model/CompleteSignHashResponse.php b/src/Model/CompleteSignHashResponse.php
index eda78496..aa958ae7 100644
--- a/src/Model/CompleteSignHashResponse.php
+++ b/src/Model/CompleteSignHashResponse.php
@@ -294,7 +294,7 @@ public function setRemainingSignatureRequests($remaining_signature_requests)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/CompleteSignRequest.php b/src/Model/CompleteSignRequest.php
index 84d6c23c..6339d529 100644
--- a/src/Model/CompleteSignRequest.php
+++ b/src/Model/CompleteSignRequest.php
@@ -384,7 +384,7 @@ public function setTransactionId($transaction_id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -396,7 +396,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -409,7 +409,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -425,7 +425,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/Credential.php b/src/Model/Credential.php
index ee13a96f..d6dd496e 100644
--- a/src/Model/Credential.php
+++ b/src/Model/Credential.php
@@ -294,7 +294,7 @@ public function setValue($value)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/CustomFieldV2.php b/src/Model/CustomFieldV2.php
index 54635c7f..5dde5e7a 100644
--- a/src/Model/CustomFieldV2.php
+++ b/src/Model/CustomFieldV2.php
@@ -326,7 +326,7 @@ public function setValue($value)
      * @param  integer $offset Offset
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -336,7 +336,7 @@ public function offsetExists($offset)
      * @param  integer $offset Offset
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -347,7 +347,7 @@ public function offsetGet($offset)
      * @param  mixed   $value  Value to be set
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -361,7 +361,7 @@ public function offsetSet($offset, $value)
      * @param  integer $offset Offset
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/DocumentSecurityStore.php b/src/Model/DocumentSecurityStore.php
index e3050cc8..5f10296c 100644
--- a/src/Model/DocumentSecurityStore.php
+++ b/src/Model/DocumentSecurityStore.php
@@ -294,7 +294,7 @@ public function setOcsps($ocsps)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/DocumentUpdateInfo.php b/src/Model/DocumentUpdateInfo.php
index c1bddec9..6d25eba6 100644
--- a/src/Model/DocumentUpdateInfo.php
+++ b/src/Model/DocumentUpdateInfo.php
@@ -414,7 +414,7 @@ public function setTimeStampField($time_stamp_field)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -426,7 +426,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -439,7 +439,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -455,7 +455,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/EnvelopeTemplateDefinition.php b/src/Model/EnvelopeTemplateDefinition.php
index c7d40d33..4eda7864 100644
--- a/src/Model/EnvelopeTemplateDefinition.php
+++ b/src/Model/EnvelopeTemplateDefinition.php
@@ -561,7 +561,7 @@ public function setUri($uri)
      * @param  integer $offset Offset
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
diff --git a/src/Model/ExternalClaim.php b/src/Model/ExternalClaim.php
index d3ed6275..e586989a 100644
--- a/src/Model/ExternalClaim.php
+++ b/src/Model/ExternalClaim.php
@@ -324,7 +324,7 @@ public function setValue($value)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -336,7 +336,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -349,7 +349,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -365,7 +365,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/FolderItem.php b/src/Model/FolderItem.php
index d802fe37..630f38cc 100644
--- a/src/Model/FolderItem.php
+++ b/src/Model/FolderItem.php
@@ -690,7 +690,7 @@ public function setUri($uri)
      * @param  integer $offset Offset
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -700,7 +700,7 @@ public function offsetExists($offset)
      * @param  integer $offset Offset
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -711,7 +711,7 @@ public function offsetGet($offset)
      * @param  mixed   $value  Value to be set
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -725,7 +725,7 @@ public function offsetSet($offset, $value)
      * @param  integer $offset Offset
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/GroupBrands.php b/src/Model/GroupBrands.php
index 85f9050c..149cf47d 100644
--- a/src/Model/GroupBrands.php
+++ b/src/Model/GroupBrands.php
@@ -295,7 +295,7 @@ public function setBrandOptions($brand_options)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -307,7 +307,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -320,7 +320,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -336,7 +336,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductField.php b/src/Model/ReportInProductField.php
index 293d9770..ed7d4358 100644
--- a/src/Model/ReportInProductField.php
+++ b/src/Model/ReportInProductField.php
@@ -326,7 +326,7 @@ public function setSelected($selected)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -338,7 +338,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -351,7 +351,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -367,7 +367,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductListItem.php b/src/Model/ReportInProductListItem.php
index f1425ee3..3a9023f1 100644
--- a/src/Model/ReportInProductListItem.php
+++ b/src/Model/ReportInProductListItem.php
@@ -626,7 +626,7 @@ public function setScheduleRenewDurationDays($schedule_renew_duration_days)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -638,7 +638,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -651,7 +651,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -667,7 +667,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductRunRequest.php b/src/Model/ReportInProductRunRequest.php
index 02dcfed0..9567c490 100644
--- a/src/Model/ReportInProductRunRequest.php
+++ b/src/Model/ReportInProductRunRequest.php
@@ -926,7 +926,7 @@ public function setVerificationStatusFilter($verification_status_filter)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -938,7 +938,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -951,7 +951,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -967,7 +967,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductRunResponseRow.php b/src/Model/ReportInProductRunResponseRow.php
index 9caaf234..8bd557d1 100644
--- a/src/Model/ReportInProductRunResponseRow.php
+++ b/src/Model/ReportInProductRunResponseRow.php
@@ -266,7 +266,7 @@ public function setFields($fields)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -278,7 +278,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -291,7 +291,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -307,7 +307,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductRunResponseRowFields.php b/src/Model/ReportInProductRunResponseRowFields.php
index 4c8f1ad2..721743eb 100644
--- a/src/Model/ReportInProductRunResponseRowFields.php
+++ b/src/Model/ReportInProductRunResponseRowFields.php
@@ -4526,7 +4526,7 @@ public function setVoidedTs($voided_ts)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -4538,7 +4538,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -4551,7 +4551,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -4567,7 +4567,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/ReportInProductSentByDetails.php b/src/Model/ReportInProductSentByDetails.php
index b76a7cd1..3e8214c6 100644
--- a/src/Model/ReportInProductSentByDetails.php
+++ b/src/Model/ReportInProductSentByDetails.php
@@ -266,7 +266,7 @@ public function setUsers($users)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -278,7 +278,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -291,7 +291,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -307,7 +307,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/Revision.php b/src/Model/Revision.php
index 939f651a..f1054b55 100644
--- a/src/Model/Revision.php
+++ b/src/Model/Revision.php
@@ -384,7 +384,7 @@ public function setStartData($start_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -396,7 +396,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -409,7 +409,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -425,7 +425,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SamlAssertionAttribute.php b/src/Model/SamlAssertionAttribute.php
index 22ea5658..81134c05 100644
--- a/src/Model/SamlAssertionAttribute.php
+++ b/src/Model/SamlAssertionAttribute.php
@@ -248,7 +248,7 @@ public function setValue($value)
      * @param  integer $offset Offset
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -258,7 +258,7 @@ public function offsetExists($offset)
      * @param  integer $offset Offset
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -269,7 +269,7 @@ public function offsetGet($offset)
      * @param  mixed   $value  Value to be set
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -283,7 +283,7 @@ public function offsetSet($offset, $value)
      * @param  integer $offset Offset
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/Seal.php b/src/Model/Seal.php
index 665b1812..47e4f8a9 100644
--- a/src/Model/Seal.php
+++ b/src/Model/Seal.php
@@ -264,7 +264,7 @@ public function setSealIdentifier($seal_identifier)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -276,7 +276,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -289,7 +289,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -305,7 +305,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/Sender.php b/src/Model/Sender.php
index 39f648eb..8d38cd2f 100644
--- a/src/Model/Sender.php
+++ b/src/Model/Sender.php
@@ -264,7 +264,7 @@ public function setCompanyName($company_name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -276,7 +276,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -289,7 +289,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -305,7 +305,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SignHashDocument.php b/src/Model/SignHashDocument.php
index 8ef3ba4e..9833431b 100644
--- a/src/Model/SignHashDocument.php
+++ b/src/Model/SignHashDocument.php
@@ -444,7 +444,7 @@ public function setSignatureType($signature_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -456,7 +456,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -469,7 +469,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void 
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -485,7 +485,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SignHashSessionInfoResponse.php b/src/Model/SignHashSessionInfoResponse.php
index c215bb18..48c62500 100644
--- a/src/Model/SignHashSessionInfoResponse.php
+++ b/src/Model/SignHashSessionInfoResponse.php
@@ -444,7 +444,7 @@ public function setUser($user)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -456,7 +456,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -469,7 +469,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -485,7 +485,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SignSessionInfoRequest.php b/src/Model/SignSessionInfoRequest.php
index d3f19c5b..fadc18e2 100644
--- a/src/Model/SignSessionInfoRequest.php
+++ b/src/Model/SignSessionInfoRequest.php
@@ -324,7 +324,7 @@ public function setSigningLocation($signing_location)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -336,7 +336,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -349,7 +349,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -365,7 +365,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SignatureDataInfo.php b/src/Model/SignatureDataInfo.php
index 94167860..05922b27 100644
--- a/src/Model/SignatureDataInfo.php
+++ b/src/Model/SignatureDataInfo.php
@@ -294,7 +294,7 @@ public function setSignatureFieldName($signature_field_name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/SignatureProperties.php b/src/Model/SignatureProperties.php
index 3985c755..f0a228aa 100644
--- a/src/Model/SignatureProperties.php
+++ b/src/Model/SignatureProperties.php
@@ -264,7 +264,7 @@ public function setSubFilter($sub_filter)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -276,7 +276,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -289,7 +289,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -305,7 +305,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/TimeStampField.php b/src/Model/TimeStampField.php
index 91e3190c..44b96d9f 100644
--- a/src/Model/TimeStampField.php
+++ b/src/Model/TimeStampField.php
@@ -294,7 +294,7 @@ public function setTimeStampFieldName($time_stamp_field_name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/TspHealthCheckRequest.php b/src/Model/TspHealthCheckRequest.php
index bdea9f24..3306a7ac 100644
--- a/src/Model/TspHealthCheckRequest.php
+++ b/src/Model/TspHealthCheckRequest.php
@@ -354,7 +354,7 @@ public function setStatusDescription($status_description)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -366,7 +366,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -379,7 +379,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -395,7 +395,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/TspHealthCheckStatusDescription.php b/src/Model/TspHealthCheckStatusDescription.php
index 1e5a2f69..0895b673 100644
--- a/src/Model/TspHealthCheckStatusDescription.php
+++ b/src/Model/TspHealthCheckStatusDescription.php
@@ -384,7 +384,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -396,7 +396,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -409,7 +409,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -425,7 +425,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/UpdateTransactionRequest.php b/src/Model/UpdateTransactionRequest.php
index c6e08a33..1887eaf4 100644
--- a/src/Model/UpdateTransactionRequest.php
+++ b/src/Model/UpdateTransactionRequest.php
@@ -294,7 +294,7 @@ public function setState($state)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -306,7 +306,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -319,7 +319,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -335,7 +335,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/UpdateTransactionResponse.php b/src/Model/UpdateTransactionResponse.php
index f6a8cbf7..1e146ef7 100644
--- a/src/Model/UpdateTransactionResponse.php
+++ b/src/Model/UpdateTransactionResponse.php
@@ -234,7 +234,7 @@ public function setRedirectionUrl($redirection_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -246,7 +246,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -259,7 +259,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -275,7 +275,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/User.php b/src/Model/User.php
index ad99b043..b82ab96d 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -384,7 +384,7 @@ public function setExternalClaims($external_claims)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists(mixed $offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -396,7 +396,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): bool
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -409,7 +409,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -425,7 +425,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/src/Model/UserInfoResponse.php b/src/Model/UserInfoResponse.php
index 2f1e3d0c..8621889c 100644
--- a/src/Model/UserInfoResponse.php
+++ b/src/Model/UserInfoResponse.php
@@ -354,7 +354,7 @@ public function setUser($user)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists(mixed $offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -366,7 +366,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet(mixed $offset): bool
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -379,7 +379,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, mixed $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -395,7 +395,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset(mixed $offset): void
     {
         unset($this->container[$offset]);
     }