/**
  * Gets all Http Headers
  *
  * @return array
  */
 private function getHttpHeaders()
 {
     $ret = array();
     foreach ($this->httpConfig->getHeaders() as $k => $v) {
         $ret[] = "{$k}: {$v}";
     }
     return $ret;
 }
 /**
  *
  * @param HttpConfig $httpConfig        	
  * @param string $request        	
  * @param mixed $options        	
  * @return mixed|void
  * @throws BitPagosConfigurationException
  * @throws BitPagosInvalidCredentialException
  * @throws BitPagosMissingCredentialException
  */
 public function handle($httpConfig, $request, $options)
 {
     $credential = $this->apiContext->getCredential();
     $config = $this->apiContext->getConfig();
     if (is_null($credential) and !empty($this->apiContext->getApiKey())) {
         $credential = false;
     }
     if (is_null($credential)) {
         // Try picking credentials from the config file
         $credMgr = CredentialManager::getInstance($config);
         $credValues = $credMgr->getCredentialObject();
         if (!is_array($credValues)) {
             throw new BitPagosMissingCredentialException("Empty or invalid credentials passed");
         }
         $credential = new OAuthTokenCredential($credValues['clientId'], $credValues['clientSecret']);
     }
     if ((is_null($credential) or !$credential instanceof OAuthTokenCredential) and empty($this->apiContext->getApiKey())) {
         throw new BitPagosInvalidCredentialException("Invalid credentials passed");
     }
     $httpConfig->setUrl(rtrim(trim($this->_getEndpoint($config)), '/') . (isset($options['path']) ? $options['path'] : ''));
     if (!array_key_exists("User-Agent", $httpConfig->getHeaders())) {
         $httpConfig->addHeader("User-Agent", BitPagosUserAgent::getValue(BitPagosConstants::SDK_NAME, BitPagosConstants::SDK_VERSION));
     }
     if (!is_null($credential) && $credential instanceof OAuthTokenCredential and is_null($httpConfig->getHeader('Authorization'))) {
         $httpConfig->addHeader('Authorization', "OAuth " . $credential->getAccessToken($config), false);
     }
     if ($credential === false and !empty($this->apiContext->getApiKey()) and is_null($httpConfig->getHeader('Authorization'))) {
         $httpConfig->addHeader('Authorization', "ApiKey " . $this->apiContext->getApiKey(), false);
     }
     // Add any additional Headers that they may have provided
     $headers = $this->apiContext->getRequestHeaders();
     foreach ($headers as $key => $value) {
         $httpConfig->addHeader($key, $value);
     }
 }