Overview
The purpose of the Account Association flow is to establish a long-lived token that both the Payment Integrator (integrator) and Google agree represents a link between this user's account and a Google bank account and carries permission to move money between these accounts. This long-lived token is called the Google Payment Token (GPT). Google calls this token an instrument. A Google customer has one or more instruments. An instrument is a way to pay for services and goods within Google's various ecosystems and marketplaces.
This exchange occurs using the associateAccount method that is hosted by the integrator. Proof of authentication-authorization is required input to this method. Proof of authentication is received as an outcome of the authentication-authorization flow. For more information see the authentication-authorization flow documentation.
This sequence diagram illustrates an example flow. 