Adapter.php

<?php
namespace Paylike;
/**
 * Class Adapter
 * @package Paylike
 * The adapter class taking care of the calls to the api.
 *
 * The purpose of this is to abstract the requests
 * so that this can be changed depending on the environment.
 *
 * @version    1.0.0
 */
if ( ! class_exists( 'Paylike\\Adapter' ) ) {
    class Adapter {

        public $apiUrl = 'https://api.paylike.io';
        private $apiKey;

        /**
         * Adapter constructor.
         *
         * @param $privateApiKey
         */
        public function __construct( $privateApiKey ) {
            if ( $privateApiKey ) {
                $this->setApiKey( $privateApiKey );
            } else {
                trigger_error( 'Private Key is missing!', E_USER_ERROR );

                return null;
            }
        }

        /**
         * @param $key
         * set the api key.
         */
        public function setApiKey( $key ) {
            $this->apiKey = $key;
        }

        /**
         * @param $url this is required, do not use the full url,
         * only prepend the params eg: transactions/' . $transactionId . '/captures'
         * @param $data this is optional
         * Actual call to the api via curl.
         *
         * @return bool|mixed
         */
        public function request( $url, $data = null, $httpVerb = 'post' ) {
            $url = $this->apiUrl . '/' . $url;
            $ch = curl_init();
            curl_setopt( $ch, CURLOPT_URL, $url );
            curl_setopt( $ch, CURLOPT_HEADER, false );
            curl_setopt( $ch, CURLOPT_HTTPHEADER, array(
                'Accept: application/json',
                'Content-Type: application/json'
            ) );
            curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
            curl_setopt( $ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2 );
            curl_setopt( $ch, CURLOPT_USERPWD, ":" . $this->apiKey );
            curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
            switch ( $httpVerb ) {
                case 'post':
                    curl_setopt( $ch, CURLOPT_POST, true );
                    if ( $data ) {
                        $encoded = json_encode($data);
                        curl_setopt( $ch, CURLOPT_POSTFIELDS, $encoded );
                    }
                    break;
                case 'get':
                    // can add args here for future use
                    break;
            }
            $result   = curl_exec( $ch );
            $httpCode = curl_getinfo( $ch, CURLINFO_HTTP_CODE );
            curl_close( $ch );
            $output = json_decode( $result, true );
            if ( $httpCode >= 200 || $httpCode <= 299 ) {
                return $output;
            } else {
                return false;
            }
        }

    }
}