Today, I try to upgrade my free plan to pro. I fill out all the credit card information, then click “Purchase” button, after a while, the popup dialog will disappear and no error information shows, and I go back to a refreshed dashboard of my account with my site listed below.
I see that issue is marked as resolved, if this was a first-time order, can you try again using the approach suggested by @sdayman? (as noted in the incident, order for existing customers are processing, but there is a delay)