ISO 20022 Technical Implementation

What You Can Do After This Chapter

Learning objective. Learner reads an ISO 20022 schema, explains amounts, timestamps and market practice, and shows how the same pacs.008 differs by rail, with correct ledger entries and validation handling. Learner also explains wash accounts, LEI, and FATF Recommendation 16 debtor and creditor data.

Practical assessment. Learner receives a case where a EUR 10,000 payment must be expressed as pacs.008.001.08 under CBPR+ rules and under SEPA rules, then drafts both messages, lists every field that changes, and explains why each change is required. Learner also drafts the T-account entries, the LEI and travel rule data, and the handling when a message fails schema validation. Learner also notes the current state in 2026, with SWIFT MT coexistence ended and Fedwire live on ISO 20022.

Expected deliverables.

• pacs.008 drafts for EUR 10,000 under CBPR+ and SEPA rules
• Field difference table: CBPR+ versus SEPA with reasons
• T-account entries and wash account note for the EUR 10,000 payment
• Schema validation and cardinality checklist with failure handling
• Per rail mapping table: CBPR+, SEPA, Fedwire, CHAPS and FedNow

Completion criterion. Learner drafts correct CBPR+ and SEPA pacs.008 messages, lists the field differences accurately, and explains validation, cardinality and ledger entries clearly, and the per rail mapping table is complete and accurate.