Allow GPDF_API_URL to be overridden via wp-config.php

[jakejackson1]

Summary

Wraps the GPDF_API_URL define in an if ( ! defined() ) guard so a site can override the licensing/update endpoint from wp-config.php. This lets a staging site point at the upcoming Cloudflare Worker licensing proxy without editing plugin code. Also adds a comment documenting why the bulk get_version params must stay numerically indexed (the API keys its response array by the same keys it receives, so numeric indices keep the response a JSON array that the response handlers decode via is_array()).

Try it

Add to wp-config.php:

define( 'GPDF_API_URL', 'https://staging-endpoint.example.com' );

Licensing and update checks now hit that endpoint; with no override they continue to use https://api.gravitypdf.com.

Test plan

• With no override defined, licensing and update checks work against https://api.gravitypdf.com as before
• With the constant defined in wp-config.php, requests go to the override endpoint

More info

Part of repointing the licensing/update API at a Cloudflare Worker proxy. The proxy-side changes (status passthrough, content-type handling, rate-limit bypass, tests) live in the gravitypdf-update-server repo. The guard is the standard WordPress constant-override idiom and is a no-op when the constant isn't pre-defined.

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