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.
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).