Abstract: A method includes receiving a request to set verification settings for a payment aggregator computing system; determining an alias account number for a transaction account based on account information; transmitting a request to the payment aggregator computing system to store the alias account number instead of the account information; receiving a transaction request from the payment aggregator computing system; implementing a verification policy comprising a first sub-policy and a second sub-policy, based on the verification settings corresponding to the alias account number and a threshold transaction amount, including: determining a predetermined threshold of a monetary amount, determining a first sub-policy monetary amount, comparing the first sub-policy monetary amount to the predetermined threshold, determining that the first sub-policy monetary amount does not meet the predetermined threshold, implementing the second sub-policy, generating and transmitting an electronic message comprising a selectable

Abstract: A method for implementing transactions includes receiving, by a first computing system, a transaction request from a second computing system, the transaction request indicating a first account number that is an alias of a transaction account having a second account number, and specifying a transaction. The method further includes determining the second account number by referencing a data structure that associates the first account number and the second account number, determining a verification policy associated with the second account number, and transmitting a verification challenge based on the verification policy. The method yet further includes receiving a response to the verification challenge, determining to authorize the transaction request based on the response to the verification challenge, and implementing the transaction involving the transaction account specified by the transaction request.