Wiki
Reference for payment professionals.
Plain-language guides to the formats, regulations, and flows that move money between banks — with links to privacy-first tools that never upload your files.
Three ways to navigate
Payment Rails
Technical detail for each rail: NACHA, FedWire, FedNow, SWIFT MX, and X9.37 — structure, messages, return codes, and how files look on disk.
Regulations
Rules and policy context: NACHA Operating Rules, Federal Reserve regulations, sanctions programs, and return-rate concepts (articles arriving progressively).
Transaction Flows
End-to-end walkthroughs: credits, returns, reversals, investigations, and settlement windows — tied back to the underlying rails.
Payment Rails
Payment Rails
back to pillars ↑NACHA format, return codes, SEC codes, and in-browser Inspector & parser.
Open → FedWireFedWire FAIM context and roadmap for wire parsing in the browser.
Open → FedNowISO 20022 FedNow notes and planned tooling.
Open → SWIFT MXMT / ISO 20022 wire family — shared wire product surface for now.
Open → CHECK (X9.37)Image cash letter & MICR — roadmap and contact.
Open →Regulations
back to pillars ↑Regulation-focused articles (NACHA rules, Reg E/D/J, OFAC, etc.) will appear here as they are published. Until then, see the Resources hub and Changelog for product updates.
Transaction Flows
back to pillars ↑Flow diagrams and step-by-step operator runbooks (ACH return vs reversal, wire investigations, FedNow credit paths) will live in this section. Topics are mirrored in the left navigation as they ship.