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How does a WordPress plugin know whether if there are updates available to download and to download those updates. What function or script controls this and how does it work?

I am assuming this would be the same function that controls whether a plugin has been purchased aka premium or has not been purchased and how do product keys work?

I want to find out because I want to dive into creating my own plugin.

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    WordPress sends a check to the wordpress.org repository. Have you really not found anything? We have covered this dozens of times here. – fuxia Jan 20 '16 at 5:06
  • This answer should clear up some of your issues: wordpress.stackexchange.com/questions/214396/… – Nathan Powell Jan 20 '16 at 5:10
  • @toscho not hundreds yet? – Nathan Powell Jan 20 '16 at 5:13
  • I also must say, great edit to this question, I may answer it tomorrow in some length due to how direct it has become. – Nathan Powell Jan 20 '16 at 5:32
  • Thank you guys, if it has been covered and I could not find it then I am sorry. I will check the links now. – LouisIsMyDog Jan 20 '16 at 14:54

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