Change Payment Method for a Subscription Paid with another Payment Method (like Stripe or PayPal)

[ChristianAF]

Describe the bug
This was reported on the WordPress forum: https://wordpress.org/support/topic/error-processing-checkout-please-try-again-at-the-time-of-change-payment-method/

Changing the Payment Method of a Subscription from PayPal (or Stripe) to Amazon Pay throws the following errors:

with Express Checkout:

with Classic way:

To Reproduce
Steps to reproduce the behavior:

1. Purchase a subscription with PayPal or Stripe
2. Go to Subscription and click on "Change Payment Method"
3. Select "Amazon" or click on the Amazon Pay Express button
4. See the error

Expected behavior
Payment Method should be able to be changed without a problem.

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only the extension is active.
• I can reproduce this bug consistently using the steps above.