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Payment Reference

In the Reference-based Payment Networks, Payments are linked to Requests via a paymentReference which is derived from the requestId and payment recipient address.

This paymentReference consists of the last 8 bytes of a salted hash of the requestId and payment recipient address, concatenated : 

last8Bytes(hash(lowercase(requestId + salt + address)))
  • requestId is the id of the request
  • salt is a random number with at least 8 bytes of randomness. It must be unique to each request
  • address is the payment address for payments, the refund address for refunds
  • lowercase() transforms all characters to lowercase
  • hash() is a keccak256 hash function
  • last8Bytes() take the last 8 bytes

Use the paymentreferencecalculator.md to calculate the payment reference.