Gr4vy Account Updater API
An Account Updater is a service provided by credit card issuers (such as banks and financial institutions) to merchants who accept recurring payments from customers. Its primary purpose is to help merchants maintain accurate and up-to-date payment information for their customers' credit or debit card accounts. In Gr4vy, the Account Updater service is provided in an on-demand and asynchronous fashion: 1. A merchant requests an update for a set of stored cards. 2. A request is submitted to a third-party service. 3. When results are ready, new card details are stored and left in standby. 4. Card details are updated when it gets determined that the original card is no longer valid (e.g. has expired).