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auth.md
The auth.md document format, discovery, registration and the two claim flows.
The specification is short by design. Start with the document format, then read whichever flow matches how your users arrive.
Everything below describes the draft. Where an implementation and this document disagree, the document is wrong and we want to hear about it.
The specification is split into four parts, each covering one decision an implementer has to make.
Paycux implements auth.md for every project. The MCP docs show it end to end.