Vendure trying to refund the entire value of the order even after there is a coupon applied - resulting in Error

[shaheerrs]

Describe the bug
Order placed with coupon code shows error "Could not find a Payment to refund" while doing complete cancellation.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'http://demo.vendure.com'
2. Place an order with a coupon with $10off / 10% off
3. Once order is in "Payment settled state", try to cancel the order completely
4. See error, in the vendure back office as "Could not find a Payment to refund", but cancellation is done.

Expected behavior
Cancellation should happen with no alert in the front end.

Environment (please complete the following information):

• @vendure/core version: 2.1.8
• Nodejs version: 16/18
• Database (mysql/postgres etc): postgres

Additional context
Here while triaging I could see that even after there is a coupon, the current code trying to refund the entire order amount including the coupon amount, which is not possible as the coupon is not added as a payment method.

[choim4389]

same here 2.1.7