There is an issue with your Electronic Arts account which will prevent SWTOR pur

@DonJoco 

Support said the account is ok , no error message on website, so would try incognito mode on chrome or delete the web browser cache and cookies, make sure payment details are ok.
They also advise to wait 24 hours before making a new attempts. If it keeps failing to contact them

https://answers.ea.com/t5/General-Discussion-Technical/INFO-Getting-Help-and-Board-Guidlines/td-p/4806237/jump-to/first-unread-message