I have a website where members earn referral points but I will not always use links. Sometimes I will use a business card where the member can write their username. I'm thinking I could use another domain whereby the visitor would be instructed to type the referrer username, then they would be redirected to the main website with the referral intact. Is there a wordpress plugin that will create that redirection url? I am using Redirection but noit sure how to integrate it with an input field.