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AB-088
MPP (Machine Payments Protocol) Support
What it means
Checks for /.well-known/mpp.json declaring Machine Payments Protocol support.
Why it matters
Agents can discover MPP-compatible endpoints and initiate machine-to-machine payments without manual configuration.
✗
What's wrong
No /.well-known/mpp.json endpoint published — agents cannot determine MPP support.
✓
What's right
GET /.well-known/mpp.json returns 200 with { "protocol": "mpp", "version": "1.0" }.
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