Tokenize a raw card for subsequent CARD_TOKEN payments without creating a payment or charging the card. Direct Payment access must be enabled for your merchant. Provide customer.id or customer.referenceId; anonymous customers are not supported. Use the returned id with the same customer and merchant in the same environment. expiresAt is a Unix timestamp in milliseconds. Tokenization does not save a reusable payment method; set storeFutureUsage on the subsequent payment to save the card. Call the secure production or sandbox host below, using your merchant API credentials. Do not send provider token or tenant identifiers.