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Card events use the same subscription, envelope and signature as other Endl webhooks, with the object in data. The objects are the same ones the endpoints return: the Enrolment, Cardholder, Card, Card transaction, Deposit and Withdrawal.
Events arrive at least once and in any order. Ignore an event id you have already processed. When two copies of an object arrive, keep the one with the newest updatedAt; for deposits and withdrawals, keep the final status (completed or failed).