US Patent 11663565 Payment proxy including a user-defined identifier

In some examples, a system generates an identifier for association with a user financial account. The identifier may have a syntax including a currency indicator and a string including one or more characters concatenated together such that the currency indicator appears immediately before the string. The system generates a user-defined identifier and maps, in a database, the user-defined identifier to the user financial account. The system receives a message indicating an intent to transfer funds from a sending user to a receiving user. The message may include the user-defined identifier in lieu of account information of the user financial account, to identify the user as the receiving user. The system parses the message to identify the user-defined identifier and accesses the account information of the user financial account using the identifier. The system initiates a transfer of funds from the sending user account to the user financial account.