Payment audit trail¶

Every payment instruction, validation result, routing decision, and ledger posting recorded with microsecond timestamp. Immutable.

Module dependencies¶

Module	Title	Required?	Contract	Reason
MOD-001	Double-entry posting engine	Required	—	Records every payment instruction and GL posting in the audit trail — depends on posting engine events.
MOD-020	Pre-payment validation suite	Required	—	Captures the pre-payment validation outcome as part of the immutable payment record.
MOD-104	AWS shared infrastructure bootstrap	Required	—	AWS shared infrastructure provisioned by MOD-104 (EventBridge buses, S3, KMS, Kinesis, Cognito) is required before this module can be deployed.
MOD-103	Neon database platform bootstrap	Required	—	Neon database and schema provisioned by MOD-103 must exist before this module can read or write Postgres.

Module	Title	As	Contract
MOD-026	IFTI / CMIR reporting trigger	Hard dependency	—
MOD-081	Payment reconciliation engine	Hard dependency	—

Policy	Title	Mode	How
PAY-002	Settlement Risk Policy	`LOG`	Settlement disputes resolved using immutable payment audit trail
PAY-003	Card Scheme Compliance Policy	`LOG`	Scheme compliance evidence — every card transaction has full processing record
REP-005	Data Quality & Assurance Policy	`LOG`	Payment data lineage from instruction to GL posting fully traceable

(No capabilities mapped)

Part of SD04 — Payments Processing Platform Compiled 2026-05-22 from source/entities/modules/MOD-022.yaml