Reference

Operator-grade reference for payment failure codes, status flows, validation, operations, and playbooks. SEPA, SWIFT, ISO 20022.

Start here

SEPA rejects & returns

Return reason codes (R01, R02, R03…) with table summary and links to detailed pages.

SWIFT network & routing failures

NACK, routing, and business rejects overview with links to detailed pages.

ISO 20022 status flows

pacs.002 status codes (ACSP, ACSC, RJCT, PDNG) and timing.

How to use this library

1.Look up the code — find the reject or status and its scheme-accurate meaning.
2.Confirm lifecycle stage — when it occurs (pre-settlement, post-return, etc.).
3.Follow investigation playbook — step-by-step trace and evidence.
4.Link to related scenarios — scheme sibling, operations, playbook cross-links.

SEPA

Return codes overview (R01, R02, R03…)
Table summary of SEPA return reason codes with links to detailed pages.
R01 – Insufficient Funds
Funds-availability outcome; when it occurs, impact, and prevention.
R02 – Account Closed
Account lifecycle; beneficiary bank returns; impact on recurring flows.

ISO 20022

pacs.002 status codes
ACSP, ACSC, RJCT, PDNG; operational meaning and timing.

SWIFT

Error codes overview (NACK, routing, business rejects)
Structured reference and lifecycle context; links to detailed pages.
NACK – Format Error
Network-level rejection; invalid BIC, missing field 59; pre-validation.
Intermediary routing failure
Field 56/57, nostro alignment, unexpected routing.

Validation

IBAN validation failure
Checksum vs scheme acceptance; BIC mismatch, closed account.

Operations

Cut-off time failure (cross-border)
Submission vs value cutoff; FX and liquidity timing; SLA risk.
Stuck payment detection
Absence-of-event detection; SLA thresholds; triage.
SLA breach monitoring
Settlement SLA by rail; event-driven monitoring; escalation.

Playbooks

Investigate a rejected SWIFT payment
Trace reconstruction; network vs correspondent vs beneficiary; evidence pack.

Preflight models these scenarios deterministically before and after execution.

Pre-execution simulation →SLA breach detection →