Onboarding of mobile-wallet datasets

A system for onboarding banking-account information (an onboarding transaction) to be use in future transactions includes a banking-device terminal with a card-reading device to read a banking card and input device(s) to receive a verification input associating the banking card with a banking customer. One or more secure bank computing devices receive the banking-account information and the verification input and verify the banking-account information corresponds with the verification input to authorize the onboarding transaction. When the onboarding transaction is authorized, the at-least- one secure bank-computing device requests a customer-device identification of a mobile- customer device to be used for future-banking transactions, The secure bank computing device(s) receive the customer-device identification and store account data associated with the customer-device identification, the banking-account information and/or the verification input so that they may be used for future-banking transactions.