What should I do if I do not agree with the amount on my Affirm Payment Plan bill? Follow Please review the details of your bill at www.affirm.com/account. If you still have an issue with your bill, please contact Affirm HERE Related articles What if I need more time to pay my Affirm Payment Plan bill? What happens if I don’t pay my Affirm Payment Plan bill? Comments 0 comments Please sign in to leave a comment.