- Added new payment error codes for subscription billing in the GraphQL Admin API (unstable now, GA in version 2026-04).
- Updated error‑code mapping for more explicit classifications, reducing generic AUTHENTICATION_ERROR and PAYMENT_METHOD_DECLINED entries (e.g., mapping to INSUFFICIENT_FUNDS).
- Fixed a temporary mapping issue (Jan 28‑Feb 4 2026) that caused a spike in TRANSIENT_ERROR events.