Why do you need my Social Security Number? December 18, 2020 21:11 Updated During the application process, Flex will run a soft credit check (this doesn’t affect your credit score). Related articles My rent varies each month, what amount do I sign up with? Are there methods I can use to pay Flex other than linking my bank account? Does Flex affect my credit? I wasn’t approved for Flex, now what? Where do I sign up for Flex? Comments 0 comments Please sign in to leave a comment.