Credit card failed, switched to PayPal to book Ryanair
Muse planned him a good-value multi-country European trip; when his U.S. credit card was declined on Ryanair, it diagnosed the problem itself and completed the purchase through PayPal instead.
Try it yourself
Copy this to Muse and replace the [brackets] with your own details:
Book me a flight on [an airline]; if payment with [a payment method] fails, diagnose the issue and complete the purchase another way.