Apple Pay Button Not Showing

Hi all,

One week ago I started using Stripe and everything appeared to be working great. I tested the payment options and everything worked fine until I came to Apple Pay.
When I tried Apple Pay on my iPhone 7 using a card I use quite often all it did was say processing and it did this for over 5 minutes, I cancelled it after maybe 7 minutes. I tried this a few more times but it did the same thing every time.
The next day the button was gone and I cannot figure out why.

Please can someone help?

Thanks
Richard