I am trying to pay for goods PayPal say my account is fine but you will still not accept my payment why

Nice to meet you, *****!
Tell me, please, what do you see when you're trying to pay?

Where do you want to pay for goods?

Tell me, please, do you use Wowcher app?

Please, go to the Apple Store and find Wowcher app there
Check if the blue button is for Update or Open

Ok, take your time, *****!

Do you see a blue button for Update or Open?

Ok, then do you see option to Delete the app?

Yes, I got it.
Do you see the option to Delete it there?

Ok
In that case, go to Home Screen. Touch and hold the app on the Home Screen, tap Remove App, and tap Delete App to delete it from iPhone.
Let me know when you are done.

Great!
Now go to App Store again, find your app and install it as a new one.
After that open, it, log in to your account and try use your payment method again.

It works?

Yes.