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A user’s permission for your app to pay with one of their cards changed. status says where it stands now: active means your app can pay with card_id without asking, revoked means the user turned it off or your app’s connection to the user ended, and retired means the user removed the card. See Enable auto-approval. grant_id names the permission on one card, and it stays the same when the user turns the permission back on. allowance_id is the same for every card the user gives your app. Each change carries the next revision for its grant_id. A delivery can repeat or arrive late, so keep the highest revision you have for each grant_id and ignore any event with a lower or equal one.