Remote Acess key?

hi i see CPANEL has a remote acess key. what programs can i use to automaticly setup accounts with the remote acess key. i would like it so people can pay with paypal then it sets them users up( there is a paypal interface code that lets the server know when the user has paid). i am looking to spend around $100-$150 for this system and for somebody to code it if it is needed. do you guys know what i should do?Remote Acess key?

 

 

 

 

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