Connect Private Website to TD Ameritrade API

I'm currently using a VPS to host my private website while using Cloudflare to assign ssl. The website consists of a simple options trading scanner (.php) that I can run to find possible trading setups. The website WILL NOT be used to actually trade, just to provide data (I don't use TD Ameritrade to execute trades). I'm having a problem connecting to the TD Ameritrade API, specifically getting token access (I think). I can get logged in but cannot get the page to display after logging in (which is supposed to happen when the tokens can't get verified). Need a professional to help with this. Would also like a login script added to my website with a username and password to secure my website so not just anyone will be able to scan. Will provide .php files and TD Ameritrade login details after hire.

Here is a youtube video of exactly what I'm trying to do:

https://www.youtube.com/watch?v=PZ-umy5mlYM&t=1139s