In case people are still having the issue noted above. I fixed it by requesting a new secret key inside stripe, deleting the old key, then updating the key in wordpress/stripe account with the new secret key. Make sure you copy the new secret key before closing the window as it says you cannot access it again for security reasons. Hope this helped someone.
I was searching for the answer as well and ended up finding it in the post above from
Alberto Olguin (@seobeto)
1 month, 2 weeks ago