Affirm sometimes needs more information about your financial situation to evaluate your loan application. They may ask you to link your online checking account, which helps determine your ability to repay a loan. If you are prompted to link your checking account and would like to continue with the application process, you may link your account by providing the login information for your online bank account. Affirm does not store your online banking login information - they simply pass your login credentials to your bank via a secure service linking your checking account.
Linking your checking account DOES NOT authorize Affirm to debit your account. It only allows them to determine your ability to pay.