Web request function checking licence key

MQL4 Experts Libraries

Specification

Hello everyone,

I need a function writes in mql4 similar this format 

<Function>                                                     
Description of the function                                     
Parameter[P1]: Description of the parameter P1, if exists       
Parameter[P2]: Description of the parameter P2, if exists       
Values[P1]: 1 [This is a default value]                
Values[P2]: 2{0}+{1} [Text within the body of the component]   
int MySum(int P1, int P2)                                     
{                                                
return(P1 + P2);           
}                                                                                         
</Function>           


This function should use webrequest() asking to my a specific URL the status of activation of a licence key inserted into an expert advisor. If the result associated is 'active' the expert have authorization to work. 


I don't know how to write it and what is necessary to do, could some of you help me ?

Thanks


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