When I try to checkout by selecting a payment method and click place order button, I get following error message,
"message": "An error occurred on the server. Please try to place the order again."
And I see
http://www.my-domain.com/rest/mystorepath/V1/carts/mine/payment-information 400 (Bad Request)
on browser console. What could cause this issue? I have disabled SSL on my site too.