__construct()

It is run Once the class is started, it defines the values on the settings page to the API class.

You can import the files of API service as in the example.

function __construct(){

    $this->config   = Modules::Config("Product",__CLASS__);
    $this->lang     = Modules::Lang("Product",__CLASS__);

    if(!class_exists("ExampleSSL_API")) include __DIR__.DS."api.php";

    $username   = $this->config["settings"]["username"];
    $password   = $this->config["settings"]["password"];
    $password   = Crypt::decode($password,Config::get("crypt/system"));
    $tmode      = (bool) $this->config["settings"]["test-mode"];

    $this->api =  new ExampleSSL_API($tmode);

    $this->api->set_credentials($username,$password);
}