Kiyoh, Klantenvertellen create Invite on API

kiyoh.php

<?php
// HELPER FUNCTION
public function endsWith( $haystack, $needle ) {
  return $needle === "" || (substr($haystack, -strlen($needle)) === $needle);
}

public function create_kiyoh_invite($order_id, $this_status_transition_from, $this_status_transition_to, $instance){
	
	$result=false;
	$current_domain = 'yourdomain.com';
	
	//  GENERAL DATA
	$kiyoh_api_key 		= 'a12b3c4d-5e6f-7g8h-9i0j-1a2b3c4d5e6f';		// YOUR KIYOH/KLANTENVERTELLEN KEY
	$kiyoh_location_id 	= 1234567;										//
	$url 				= 'https://www.kiyoh.com/v1/invite/external';
	
	// URL PARAMETERS
	$data['hash']		= $kiyoh_api_key;
	$data['locationId']	= $kiyoh_location_id;
	$data['tenantId']	= 98;					// 99 FOR KLANTENVERTELLEN
	$data['location_id']= $kiyoh_location_id;
	$data['delay']		= 1;
	$data['language']	= 'nl';
	$data['ref_code']	= $order_id;
	
	
	// IF STATUS IS SET TO SENT, ANYOTHERSTATUS
	if(in_array($this_status_transition_to,array('sent','any-other-status'))){
		
		// GET ORDER DATA
		$order = wc_get_order($order_id);
		
		$kk_review_invite_created = get_post_meta($order_id, 'kk_review_invite_created', true);
		if (!empty($kk_review_invite_created)){
			$order->add_order_note( 'Geen nieuwe Kiyoh invite. Deze was al aangemaakt voor deze order!' );
			return false;			
		}
		
		// URL PARAMETERS
		$data['invite_email'] 	= $order->get_billing_email();
		$data['first_name']		= $order->get_billing_first_name();
		$data['last_name']		= $order->get_billing_last_name();
		
		// IF ORDER IS FROM LIEVELABELS DO NOT CREATE KIYOH REQUEST
		if($this->endsWith( $data['invite_email'], $current_domain )){
			$order->add_order_note( 'Geen Kiyoh invite voor ' . $current_domain );
			return false;
		}
		
		// CREATE FULL URL
		$url = sprintf("%s?%s", $url, http_build_query($data));
		
		// MAKE GET API CALL TO SET INVITE IN X DAYS
		$curl = curl_init();
		
		// SET CURL OPTIONS
		curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 60); 
		curl_setopt($curl, CURLOPT_TIMEOUT, 400);
		curl_setopt($curl, CURLOPT_URL, $url);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
   
		// EXECUTE CURL AND GET RESULT
		$result = curl_exec($curl);
		$resultCheck = json_decode($result);
		
		if ($result==false || $resultCheck->code!='OK' ) {
			update_post_meta($order->get_id(), 'kk_review_invite_created', current_time('mysql'));
			// ADD ERROR TO ORDER NOTES
			$detailedError = $resultCheck->detailedError[0]->message;
			$order->add_order_note( 'Kiyoh uitnodiging niet aangemaakt: ' . $detailedError );

			curl_close($curl);
			return false;

		}
		
		// ADD NOTE TO ORDER
		$order->add_order_note( 'Kiyoh uitnodiging aangemaakt' );
		
		curl_close($curl);				
		
		// UPDATE META ON SUCCES 
		update_post_meta($order->get_id(), 'kk_review_invite_created', current_time('mysql'));
	}
	return $result;
}