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Phase 1 of the UMA core protocol involves the authorizing user introducing the host and AM so they can work together. Phases 2 and 3 together involve the requesting party, using a requester, making an access attempt, being tested for suitability by the AM to receive a permission, and ultimately succeeding or failing in the attempt by presenting a token with permissions associated with it.
Further reading:
- Web sequence diagram for Phase 1 as of core spec rev 07b (6 Jan 2013) and binding obligations rev 01 (13 Jan 2013)
- Web sequence diagram for Phases 2 and 3 as of rev 07b (6 Jan 2013) and binding obligations rev 01 (13 Jan 2013)
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UMA's Relationship to Other Efforts
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