drmrbrewer

[marble bough]

Hello! There's currently no way for Checkout to set the Customer's invoice_settings.default_payment_method. You would need to do this separately in your own code, probably in a webhook handler for checkout.session.completed.

[rancid wolf]

OK, what is the method for doing this?

[marble bough]

You would update the Customer and set the Payment Method here: https://stripe.com/docs/api/customers/update#update_customer-invoice_settings-default_payment_method