PostID = FunctionParameters["Bitrix24_HookPostID"];
    URL    = FunctionParameters["Bitrix24_URL"];

    Result = OPI_Bitrix24.GetImportantPostViewers(URL, PostID);

    URL   = FunctionParameters["Bitrix24_Domain"];
    Token = FunctionParameters["Bitrix24_Token"];

    Result = OPI_Bitrix24.GetImportantPostViewers(URL, PostID, Token);