Hello,
We are here to help but for this we need from you to help us too, right now, from what you give us it's impossible.
I just had a look on your website, here my advices in order to progress on this subject :
- You have to published Stripe payment in order to process some tests (and why don't add some ACL in order to only by display for super administrator and our account in order to avoid displaying for all a non-working paymenet plugin).
- Your login error message isn't maybe normal but obviously it's not linked to your checkout issue with Stripe.
Don't you have any other error message, and especially in your checkout process ?
Follow our advices, answer step by step precisely and we will go forward about this.
Awaiting news from you.
Regards