SumUp Integration not working

I am trying to set up SumUp to take payment for all listings. I have authorized every listing and enabled prepay.

When testing the Direct Booking Engine I am not taken to the SumUp checkout at all. When testing the One Page Website I am taken to https://nobeds.app/sumup-checkout-session and get a HTTP 500 error with no further details.

Can you please look into this so that we can take pre-payment with SumUp via the Direct Booking Engine and One Page Website.