Como usa a API ? about apiplus-magento HOT 1 CLOSED

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://ENDEREÇO DA LOJA/api/json");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, FALSE);
curl_setopt($ch, CURLOPT_POST, TRUE);

$arrayjson = array(
	'resource' => "catalog_category.info",

);
$json = json_encode($arrayjson);

curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
	"Content-Type: application/json;charset=utf-8",
	"apiUsername: USERNAME",
	"apiKey: APIKEY",
	"Accept: application/json"
));
$response = curl_exec($ch);
curl_close($ch);

print_r($response);