marketplaces/docs/architecture/foundation/adr/ADR-010-backward-compatibility-for-auth-payment-authorization.md

ADR-010: Backward Compatibility for Authentication, Payment, and Authorization

Status: Accepted Date: 2026-07-03

Context

Authentication and payment flows are proven and contract-sensitive. Platform refactoring must not break existing integrations.

Decision

Freeze behavior and contracts for:

• Authentication flow.
• Payment API interactions.
• Authorization logic.

Allow only encapsulation and integration-layer isolation, not contract redesign.

Consequences

Positive:

• Prevents regressions in critical commerce and access flows.
• Enables architecture modernization around stable core behavior.

Negative:

• Some suboptimal legacy internals may remain until controlled replacement strategy is approved.

Compliance Requirements

• Existing auth/payment request/response contracts remain unchanged.
• Behavior-equivalent wrappers/adapters are allowed.
• Any change requires explicit ADR and compatibility test evidence.