Credit card requirement at online check-in
When people fill in the online check-in they reach the last step and are required to fill in their credit card details. In our country (the Netherlands) it's not customary that people own a credit card and are therefore often stuck at this step of the online check-in and don't know what to do next. It would be helpful to put a custom message at this step of the online check-in like "To proceed with the online check-in you're gonna need a creditcard. If you do not want to leave your creditcard details here or you don’t have one: no worries, you can just leave the check- in process. The data you already filled out was successfully saved.
Erhan B commented
If a customer booked with e.g. Airbnb oder BookingCom and they already pre-paid, it is difficult to communicate this matter: "You can just leave the check-in process at this point". From a guest journey perspective it would be very nice to have the same success response as you would have if you completed the check-in with credit card information.