The error message below is what I get each time I try to pay for an apartment.
This credit card can’t be added right now. Please wait and try again later. You can also try using a previously added credit card or a different way to pay, such as PayPal.
Are you using the app or are you on the website? If you're on the website you can try deleting your cookies and browser history, that often fixes quite a lot of issues. If you're using the app, try deleting and reinstalling the app.