Record quotation and payment integration delivery links

docs/implementation.md

@@ -964,3 +964,7 @@ payments or deploy either repository. Generic ambiguous rejections remain pendin
 for operational reconciliation. Cross-session analytics retention, additional
 funding/recipient onboarding, backend locale saving and external history ingestion
 remain separate capabilities. Unrelated notifications runtime changes are excluded.
+
+Delivered in [PR #51](https://git.sendico.io/tech/sxchnge/pulls/51), targeting
+`identity-verification-48`. Merge order is #47 → #49 → #51; deploy Sendico #2897
+before SXCHNGE #51. Both implementation branches are pushed and remain unmerged.