After choosing "customize this plan" and moving two sliders, I hit pay and am transported to an error on this page https://www.pythonanywhere.com/user/[username]/account/stripe_enter_card_data
After choosing "customize this plan" and moving two sliders, I hit pay and am transported to an error on this page https://www.pythonanywhere.com/user/[username]/account/stripe_enter_card_data
I waited a bit and came back and the transaction went through.
Glad to hear that!