2020-11: RFC 8905: "The 'payto' URI Scheme for Payments" published
We are happy to announce the publication of RFC 8905 by the IETF.
RFC 8905 defines the 'payto' Uniform Resource Identifier (URI) scheme for designating targets for payments.
A unified URI scheme for all payment target types allows applications to offer user interactions with URIs that represent payment targets, simplifying the introduction of new payment systems and applications.
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You can download the RFC from here.