ebay api request using wp_remote_post

cedRequest.php

<?php
class Cedrequest {


	public $devID;
	public $appID;
	public $certID;
	public $serverUrl;
	public $compatLevel;
	public $siteID;
	public $verb;
	public $ebayConfigInstance;
	public $oauthCodeGrantUrl;

	/** __construct
	Constructor to make a new instance of eBaySession with the details needed to make a call
	Note that authentication credentials (normally token, but could be username and password)
	are assumed to come in the request body, and not in the constructor args
	Input:  $developerID - Developer key obtained when registered at http://developer.ebay.com
	$applicationID - Application key obtained when registered at http://developer.ebay.com
	$certificateID - Certificate key obtained when registered at http://developer.ebay.com
	$useTestServer - Boolean, if true then Sandbox server is used, otherwise production server is used
	$compatabilityLevel - API version this is compatable with
	$siteToUseID - the Id of the eBay site to associate the call iwht (0 = US, 2 = Canada, 3 = UK, ...)
	$callName  - The name of the call being made (e.g. 'GeteBayOfficialTime')
	Output: Response string returned by the server
	 */

	public function __construct( $siteToUseID, $callName ) {
		$this->loadDepenedency();
		$this->devID             = $this->ebayConfigInstance->devID;
		$this->appID             = $this->ebayConfigInstance->appID;
		$this->oauthCodeGrantUrl = $this->ebayConfigInstance->oauthCodeGrantUrl;
		$this->certID            = $this->ebayConfigInstance->certID;

		$this->compatLevel = $this->ebayConfigInstance->compatLevel;

		$this->siteID    = $siteToUseID;
		$this->verb      = $callName;
		$this->serverUrl = $this->ebayConfigInstance->serverUrl;
	}


	/** SendHttpRequest
	Sends a HTTP request to the server for this session
	Input:  $requestBody
	Output: The HTTP Response as a String
	 */
	public function sendHttpRequest( $requestBody ) {
		// $headers = $this->buildEbayHeaders();
		$response = wp_remote_post( $this->serverUrl, array(
			'body'    => $requestBody,
			'headers' => [
				'Content-Type' => 'application/x-www-form-urlencoded',
				'X-EBAY-API-COMPATIBILITY-LEVEL' =>  $this->compatLevel,
				'X-EBAY-API-DEV-NAME' => $this->devID,
				'X-EBAY-API-APP-NAME' => $this->appID,
				'X-EBAY-API-CERT-NAME' => $this->certID,
				'X-EBAY-API-CALL-NAME' => $this->verb,
				'X-EBAY-API-SITEID' => $this->siteID,
			],
			'httpversion' => '1.0',
			'sslverify' => false,
		) );
		if ( is_wp_error( $response ) ) {
			$error_message = $response->get_error_message();
			return $error_message;
		} else {
			return $this->ParseResponse( $response['body'] );
		}
	}

	public function ParseResponse( $responseXml ) {
		$sxe = new SimpleXMLElement( $responseXml );
		$res = json_decode( json_encode( $sxe ), true );
		return $res;
	}
	/**
	 * Function loadDepenedency
	 *
	 * @name loadDepenedency
	 */
	public function loadDepenedency() {
		if ( is_file( __DIR__ . '/ebayConfig.php' ) ) {
			require_once 'ebayConfig.php';
			$this->ebayConfigInstance = Ebayconfig::get_instance();
		}

		if ( is_file( __DIR__ . '/MultiPartMessage.php' ) ) {
			require_once 'MultiPartMessage.php';
		}

	}
}