PAR Lookup

Payment Account Reference — track the same card fingerprint across merchants without exposing card data.

Card Fingerprint

Hazel derives a deterministic PAR from card details using HMAC-SHA256. Same card always produces the same hash.

How PAR works:

1 Card details (network, last4, expiry, name) are hashed with HMAC-SHA256

2 Same card at any merchant produces the same PAR hash

3 Partners can query all receipts for a card without seeing card data

Linked Receipts

Receipts linked to the same card will appear here

Load a sample PAR and click Lookup