This is the new international financial transactions standard backed by SWIFT. There is two PDFs attached:
- Intro_To_ISO-20022.pdf: a general introduction using slides that is non-technical
- swift_iso_20022_for_dummies_6th_edition_dec_2022.pdf: an introduction book that is 65 pages that does go deep into the technical aspects of the standard.
Link: https://www.iso20022.org/
Here is a good synopsis with clear langauge: https://www.usbank.com/corporate-and-commercial-banking/insights/payments-hub/trends/demystifying-iso-20022.html