feat(mpp): preserve challenge opaque and carry settlement amount/currency#29
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nkavian merged 1 commit intoJul 3, 2026
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…ency Echo the seller's opaque (and the full challenge) verbatim through parse -> credential so an issuer's HMAC challenge binding (opaque is slot 6 of the binding input) can be recomputed on redeem. Dropping opaque silently broke verification against spec-compliant MPP sellers. Add optional amount/currency to MppReceipt so a seller can reconcile the settled figure. Both fields are optional and omitted when absent, keeping older wire artifacts byte-compatible.
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Echo the seller's opaque (and the full challenge) verbatim through parse -> credential so an issuer's HMAC challenge binding (opaque is slot 6 of the binding input) can be recomputed on redeem. Dropping opaque silently broke verification against spec-compliant MPP sellers.
Add optional amount/currency to MppReceipt so a seller can reconcile the settled figure. Both fields are optional and omitted when absent, keeping older wire artifacts byte-compatible.