[NatWest/RBS/Ulster] Why is my payment cancelled after authentication?

If there are unaccepted parameters on the payment request, the provider will cancel the payment after authentication, redirecting back to your app with a Cancelled status.

These parameters can be some of the following:

• Special characters on the beneficiary_reference or remitter_reference fields. Please refer to this article to see the special characters allowed for each provider.
• Wrong remitter details (sort-code and account number).