Creating functions for API's

Hello, I am developing my own website and am planning on incorporating different APIs. I am trying to do this myself since mid January starting with the twitter API, however, I keep running into problems I do not know the answer to. So I would like to hire somebody that knows about incorporating Twitter, YouTube and Paypal (preferably also Facebook and Instagram). The things I would like the APIs to do are the following; Twitter: (1) Sign in (transfer data into my database) (2) Check if the Person follows me (3) If not, let them click a button to follow (4) Let them Tweet a certain Phrase with a link through clicking a button. (5) Check if they tweeted the exact Phrase and didnt change the original (6) Retweet one of my Tweets (Facebook:) (1) Sign in (transfer data into my database) (2) Follow my Site (3) Share certain Posts through clicking a button Paypal: (1) Let them pay with paypal (Instagram:) (1) Sign in (transfer data into my database) (2) Follow my Site YouTube: (1) Sign in (transfer data into my database) (2) Subscribe to my channel If you are interested, please place a bit and try to contact me through a private message. I think this is not a lot of work for somebody that know what he is doing. Once we agreed on the project, I will give you details to my databases and website. I am looking forward to hearing from you! Sincerely, Jan Breuer