If the credit card is registered after the invoice has been issued

If a user registers a subscription, will it be automatically debited when the user registers a credit card to the customer card after the invoice is issued?

If you pass a card_id in the CreateSubscription endpoint, then it will be charged immediately (or, when the start_date occurs if you specify one in the future). If you do not supply a card_id, then it will email an invoice to the customer and they can pay whenever they like.

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How do I add a card with an update subscription?

In the UpdateSubscription request, you would pass the card_id (and I think a customer_id that it’s linked to is required as well).

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