Get me TikTok "Check Username" endpoints

I will be using this for a TikTok Autoclaimer, and I basically need a check endpoint to check for the username availability status (if it's taken or not). Pretty simple, if you could also make the autoclaimer(will also need a claim endpoint, if you can find this check endpoint I'm sure it wouldn't be hard to get this). Most of these can be obtained with a mobile emulator if you didn't know, with SSL Unpinning, not sure where to go from there myself. I can pay with Cashapp, Bitcoin or maybe some other payments, I will need to exchange for the others.