Verify and consume an MPP credential
MPP
Verify and consume an MPP credential
Merchant-side endpoint. Atomically consumes the credential via CAS, drives the intent FSM to completed, writes the transactions row with rail=‘mpp’, and emits the Payment-Receipt. Authenticated by the merchant secret key (X-Merchant-Key). Errors use RFC 9457 Problem Details.
POST
Verify and consume an MPP credential
Authorizations
Merchant secret key (mer_sk_*) issued at merchant onboarding. One-shot reveal — never re-shown after create.
