Stuck at 'Pick a Plan for your Business' page

When I log in to my account I am presented with the ‘Pick a Plan for your Business’ page.

I am able to select an option, but then I have to fill in credit card details in the lower section.

When I do this I get a Stripe error ‘This integration surface is unsupported for publishable key tokenization’. I then follow the link to Stripe and make the requested change but it seems to make no difference to Pelcro.

I am therefore stuck on this page forever ! Please help !