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fix(billing): prevent Plus demotion on duplicate checkout expiry - #28
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beginCheckout must not overwrite active_plus or grace_period with checkout_pending. When an abandoned checkout session expires, restore the subscription from authoritative entitlement state instead of downgrading paying customers to free. Co-Authored-By: Cursor Agent <cursoragent@cursor.com> Co-authored-by: drferdiiskandar <drferdiiskandar@sentrahai.com>
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This was referenced Oct 8, 2026
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Bug and impact
An workspace already on Plus (
active_plus) could callPOST /v1/billing/checkout.beginCheckoutunconditionally setsubscription.statetocheckout_pending. When that second Xendit session expired,applyVerifiedPaymentEventtreated it like an abandoned first-time checkout and downgraded the workspace to free, revoking Plus without a real renewal failure.Root cause
beginCheckoutfor existing paid states.checkout_pending→freeon expiry, but did not consider entitlement/subscription desync when checkout was opened on top of an active subscription.Fix
active_plusorgrace_period(409).renewal_failedwithcheckout_pending, if entitlement is stillactive_plusorgrace_period, restore the subscription row from entitlement instead of downgrading to free.Validation
vitest run packages/db/src/platform.test.ts— 15 passed (includes new regression tests).