ISO 20022 was developed by the ISO banking working group. It's the standard for messaging in digital financincial infrastructure, using different vocabularies to structure payment messages in machine readable XML.
There are related standards, for e.g. ISO 15022 for cross-border settlement; ISO 8583 for most credit card transactions,
ISO has three layers:
An ISO dictionary defines all the different vocabularies and how they are used: https://www.iso20022.org/standardsrepository