Module payer 

Payment-sender declaration and payment-account history (anti-triangulation).

A buyer commits to the fiat account it will pay from by sending only a hash of the canonicalised account details (PayerDeclaration); the plaintext travels buyer → seller over the peer channel and never reaches Mostro. Mostro answers the seller with aggregate counters for that (buyer, payment_hash) pair (PaymentHistory).

The canonicalisation rules are a client contract defined in the protocol book (payer_declaration.md); this module only fixes the hash construction so every client derives the same value from the same canonical string.

Structs

PayerDeclaration

Buyer’s commitment to the fiat payer identity for one order.

PaymentHistory

Aggregate, order-scoped history of a (buyer, payment_hash) pair.

Enums

BuyerMode

Whether the buyer’s history is meaningful for this order.

Constants

PAYMENT_HASH_DOMAIN

Domain-separation prefix hashed in front of the canonical payment data.

PAYMENT_HASH_HEX_LEN

Length, in hex characters, of a valid PayerDeclaration::payment_hash.

PAYMENT_HASH_ORDER_DOMAIN

Domain-separation prefix of the order-bound declaration a full-privacy buyer sends (see order_bound_payment_hash).

Functions

is_valid_payment_hash

true when hash is exactly 64 lowercase hexadecimal characters.

order_bound_payment_hash

The declaration hash of a full-privacy buyer, bound to one order.

payment_hash

Hash an already-canonicalised payment-data string.