Methods and apparatus for preventing fraud in payment processing transactions

A system comprising:

• a processor;
• and
• a storage device operably connected to the processor, the storage device storing instructions configured to cause the processor to:
• receive an authorization request for a purchase transaction, the authorization request including a first account number;
• determine that the authorization request arose from proximity-reading a proximity payment device;
• determine from a BIN portion of the first account number that the first account number belongs to a class of account numbers reserved for proximity-reading transactions;
• map the first account number into a second account number associated with the first account number;
• and
• transmit the authorization request to an issuer financial institution with the second account number substituted for the first account number in the authorization request.