How to redirect custom domain to my project domain

I was trying to build a URL shortener. My primary domain is makemyshortener.com But as i need to make URL shortener i need to make my URL short so after shortening the main url it's converted to mms.com/eer22 My problem is whenever user click on the shortened link i.e. (mms.com/eer22) how to check it with my main domain database?

via Chebli Mohamed