[2026-05-12 22:29:23] CALLBACK HIT: /backend/payment_callback.php
[2026-05-12 22:29:23] status=fail txnId=
[2026-05-12 22:29:23] ERROR: empty txnId
[2026-05-15 04:37:57] CALLBACK HIT: /backend/payment_callback.php?status=test&txnId=TEST123
[2026-05-15 04:37:57] status=test txnId=TEST123
[2026-05-15 04:37:57] ERROR: txnId not in DB: TEST123
