US Patent 11651357 Multifactor authentication without a user footprint

Embodiments implement multifactor authentication without a user footprint. An application programming interface call from a client application can be received that includes a messaging identifier. A transaction identifier can be transmitted to the client application and stored. Using a shared secret, a temporary password can be generated, where the shared secret can be associated with the transaction identifier and can be stored. The temporary password can be transmitted to the messaging identifier. A second application programming interface call can be received that includes a reference transaction identifier and input, where a user provides the input to the client application. The user can be authenticated when the reference transaction identifier matches a transaction identifier stored and the input matches an expected password that is based on a stored shared secret associated with the matching stored transaction identifier. A success indicator can be transmitted to the client application based on the authentication.