Are you getting the "oh no something went wrong" message? I have had this issue for days and it's only on my Mac (which I know is not related to my Mac). I was going to suggest trying an iPad, another PC, your phone etc as strangely logged in to my same account I can get past the check out option but not on my Mac. A close friend has had the issue longer than me (on her PC) and she says she just keeps trying and finally it goes through. I don't have time for all that - lol.
Heather