chore: mark t524 complete (already implemented via pr:#737)

Author: superdav42

TODO.md

@@ -114,4 +114,4 @@ Overall coverage: **35%** (20,720 / 59,212 statements). 90 files at 0% coverage.
 - [x] t521 chore: remove stale @todo comments for already-implemented methods #enhancement #auto-dispatch ~1h ref:GH#691 pr:#693 completed:2026-03-29
 - [x] t522 test(integrations): write unit tests for integration provider classes (bunnynet, cloudways, enhance, laravel-forge, plesk, rocket, serverpilot, wpengine, wpmudev) #testing #auto-dispatch ~4h ref:GH#697 pr:#698 completed:2026-03-29
 - [x] t523 feat(paypal): PayPal PPCP integration review compliance — disconnect disclaimer, onboarding failure UI, merchant status validation, payee field, debug ID logging @superdav42 #paypal #compliance ~8h ref:GH#725 pr:#726 completed:2026-04-01
-- [ ] t524 feat(checkout): add simple checkout form template with auto-generated credentials (re-implement PR #740 which was closed due to merge conflicts) #enhancement #auto-dispatch ~4h ref:GH#746 logged:2026-04-03
+- [x] t524 feat(checkout): add simple checkout form template with auto-generated credentials (re-implement PR #740 which was closed due to merge conflicts) #enhancement #auto-dispatch ~4h ref:GH#746 pr:#737 completed:2026-04-04