Amazon Pay: Subscription renewal failure.

[malithsen]

Describe the bug
Subscriptions fails to auto-renew with the following error when using Amazon Pay:

Sorry, we are unable to process the payment at this time. Reason: You cannot confirm this PaymentIntent because it’s missing a payment method. You can either update the PaymentIntent with a payment method and then confirm it again, or confirm it again directly with a payment method or ConfirmationToken.

To Reproduce
Steps to reproduce the behavior:

1. As a merchant, navigate to 'WooCommerce -> Settings -> Subscriptions'
2. Enable 'Display the auto renewal toggle' and click 'Save changes' button on page bottom.
3. As a shopper, purchase a subscription using Amazon Pay. Note the subscription ID on the confirmation page.
4. As a merchant go to WooCommerce -> Status -> Scheduled actions and search actions by the subscriptions ID.
5. Run the actions with the name woocommerce_scheduled_subscription_payment.
6. Go to WooCommerce -> Orders.
7. Note that the subscription renewal failed.