pain001

Generate and validate ISO 20022 payment files (pain.001 v03-v12, pain.008) from CSV, SQLite, JSON, or Parquet. XSD and SEPA scheme validation, pain.002 and camt.053 parsers and builders, plus a CLI, REST API, MCP server, and LSP server for editor diagnostics.. Maintained by sebastienrousseau on GitHub, where it has earned 45 stars from the community.

It's actively developed around banking, bic, csv, and is a solid reference for anyone building with these tools.