Ecommerce Stripe API Error

I’m adding a Stripe payment method to an Ecommerce website. When I add the Stripe credentials, it looks like it is going to connect, but then gives an “API Error.” What am I doing wrong?

Here is my site Read-Only:

Same problem here. No idea how to even approach solving this.

Hello there! Have you solved the problem? We have the same issue. Thank you in advance!