private function PPHttpPost($methodName_, $nvpStr_) {

		// Set up your API credentials, PayPal end point, and API version.
		$API_UserName = urlencode($this->Username);
		$API_Password = urlencode($this->Password);
		$API_Signature = urlencode($this->Signature);
		$API_Endpoint = "https://api-3t.paypal.com/nvp";

		if ("sandbox" === $this->environment || "beta-sandbox" === $this->environment)
		{
			$API_Endpoint = "https://api-3t." . $this->environment . ".paypal.com/nvp";
		}

		//$version = urlencode('51.0');
		$version = urlencode('62.0');

		// Set the curl parameters.
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $API_Endpoint);
		curl_setopt($ch, CURLOPT_VERBOSE, 1);

		// Turn off the server and peer verification (TrustManager Concept).
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_POST, 1);

		// Set the API operation, version, and API signature in the request.
		$nvpreq = "METHOD=$methodName_&VERSION=$version&PWD=$API_Password&USER=$API_UserName&SIGNATURE=$API_Signature$nvpStr_";

		// Set the request as a POST FIELD for curl.
		curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);

		// Get response from the server.
		$httpResponse = curl_exec($ch);

		if(!$httpResponse) {
			throw new Exception("$methodName_ failed: ".curl_error($ch).'('.curl_errno($ch).')');
		}

		// Extract the response details.
		$httpResponseAr = explode("&", $httpResponse);

		$httpParsedResponseAr = array();
		foreach ($httpResponseAr as $i => $value) {
			$tmpAr = explode("=", $value);
			if(sizeof($tmpAr) > 1) {
				$httpParsedResponseAr[$tmpAr[0]] = $tmpAr[1];
			}
		}

		if((0 == sizeof($httpParsedResponseAr)) || !array_key_exists('ACK', $httpParsedResponseAr)) {
			throw new Exception("Invalid HTTP Response for POST request($nvpreq) to $API_Endpoint.");
		}

		return $httpParsedResponseAr;
	}