PHP Code

// Set variables for our request
$shop = "demo-shop";
$request_headers = array(
	"Content-type" => "application/json", // Tell Shopify that we're expecting a response in JSON format
	"client_id" => "1r30mrvCFMfq2DLGuIXyY2veEJVgTtDD", // Your app API key
	"client_secret" => "TBB5wltKarRtKn5mUVZck9RxHePNN6Jo", // Your app credentials (secret key)
	"code" => $_GET["code"] // Grab the access key from the URL
);

// Call our Shopify function
$shopify_response = shopify_call(NULL, $shop, "/admin/oauth/access_token", $request_headers, 'POST', $request_headers);

// Convert response into a nice and simple array
$shopify_response = json_decode($shopify_response['response'], TRUE);

// Store the response
$token = $shopify_response['access_token'];