:FTU, data validation & error recovery, ready to enable on Nightly-only / Partner / End-to-end User Testing (not riding the trains)
;M4
:tab modal payment sheet, handling spec additions (e.g. retry, merchant field-specific errors, and new events) and UI bug fixes (not polish), gathering user testing and merchant feedback
;Later
:a11y, address autofill de-duplication fixes, security edge cases, final strings, P1 telemetry probes, "update" badge, UI feature complete, ready for release users, visual polish/animations