public static function generateAccessToken()
{
//the base uri for api requests
$queryBuilder = Configuration::$BASEURI;
//prepare query string for API call
$queryBuilder = $queryBuilder . '/token';
//validate and preprocess url
$queryUrl = APIHelper::cleanUrl($queryBuilder);
//prepare headers
$headers = array('user-agent' => 'APIMATIC 2.0', 'Accept' => 'application/json', 'Authorization' => sprintf('Basic %1$s', base64_encode(Configuration::$clientID . ':' . Configuration::$clientSecret)));
//prepare parameters
$parameters = array('grant_type' => 'client_credentials');
//prepare API request
$request = Unirest::post($queryUrl, $headers, $parameters);
//and invoke the API call request to fetch the response
$response = Unirest::getResponse($request);
//Error handling using HTTP status codes
if ($response->code == 500) {
throw new APIException('Authentication error', 500, $response->body);
} else {
if ($response->code < 200 || $response->code > 206) {
//[200,206] = HTTP OK
throw new APIException("HTTP Response Not OK", $response->code, $response->body);
}
}
if (isset($response->body->error)) {
throw new APIException($response->body->error->code, $response->body->error->http_code, $response->body->error->message);
}
if (!isset($response->body->access_token)) {
throw new OAuthException('Access token is missing.');
}
Configuration::$oAuthAccessToken = $response->body->access_token;
return $response->body->access_token;
}
