Blockchain Receive Payments API v2 HD BIP32 xpub

//set parameters
    $api_key = "your_blockchain_api_Key";
    $xpub = "xpubYour_extended_public_key";
    $secret = "your_secret"; //this can be anything you want
    $rootURL = "http://yourrooturl.com/directory"; //example https://mysite.org  or http://yourhomepage.com/store
    $orderID = uniqid();

//call blockchain info receive payments API
    $callback_url = $rootURL."/callback.php?invoice=".$orderID."&secret=".$secret;
    $receive_url = "https://api.blockchain.info/v2/receive?key=".$api_key."&xpub=".$xpub."&callback=".urlencode($callback_url);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_URL, $receive_url);
    $ccc = curl_exec($ch);
    $json = json_decode($ccc, true);
    $payTo = $json['address'];