A computer server includes a transaction processor that is configured to receive from a POS terminal an incoming authorization request that includes an original numeric value, a token cryptogram and an identification number identifying an identity token; confirm that the token cryptogram was generated from the original numeric value and a cryptographic key associated with the token; determine primary and secondary numeric values from the original numeric value and a user profile associated with the identification number; confirm that the secondary numeric value is not greater than the balance in a loyalty points account associated with the identification number; transmit to an authorization server a revised authorization request that includes the identification number and the primary numeric value; and receive from the authorization server a confirmation message confirming that the primary numeric value is not greater than the balance in a payment account associated with the identification number.