Magento 2 – Authorization Failed During Category Creation Using REST API

The documentation on Magento's site has a good example here

Here's one of the examples that they give for creating a simple product as an Admin user with OAuth authentication.

session_start();
if (!isset($_GET['oauth_token']) && isset($_SESSION['state']) && $_SESSION['state'] == 1) {
$_SESSION['state'] = 0;
}
try {
$authType = ($_SESSION['state'] == 2) ? OAUTH_AUTH_TYPE_AUTHORIZATION : OAUTH_AUTH_TYPE_URI;
$oauthClient = new OAuth($consumerKey, $consumerSecret, OAUTH_SIG_METHOD_HMACSHA1, $authType);
$oauthClient->enableDebug();

if (!isset($_GET['oauth_token']) && !$_SESSION['state']) {
    $requestToken = $oauthClient->getRequestToken($temporaryCredentialsRequestUrl);
    $_SESSION['secret'] = $requestToken['oauth_token_secret'];
    $_SESSION['state'] = 1;
    header('Location: ' . $adminAuthorizationUrl . '?oauth_token=' . $requestToken['oauth_token']);
    exit;
} else if ($_SESSION['state'] == 1) {
    $oauthClient->setToken($_GET['oauth_token'], $_SESSION['secret']);
    $accessToken = $oauthClient->getAccessToken($accessTokenRequestUrl);
    $_SESSION['state'] = 2;
    $_SESSION['token'] = $accessToken['oauth_token'];
    $_SESSION['secret'] = $accessToken['oauth_token_secret'];
    header('Location: ' . $callbackUrl);
    exit;
} else {
    $oauthClient->setToken($_SESSION['token'], $_SESSION['secret']);
    $resourceUrl = "$apiUrl/products";
    $productData = json_encode(array(
        'type_id'           => 'simple',
        'attribute_set_id'  => 4,
        'sku'               => 'simple' . uniqid(),
        'weight'            => 1,
        'status'            => 1,
        'visibility'        => 4,
        'name'              => 'Simple Product',
        'description'       => 'Simple Description',
        'short_description' => 'Simple Short Description',
        'price'             => 99.95,
        'tax_class_id'      => 0,
    ));
    $headers = array('Content-Type' => 'application/json');
    $oauthClient->fetch($resourceUrl, $productData, OAUTH_HTTP_METHOD_POST, $headers);
    print_r($oauthClient->getLastResponseInfo());
}
} catch (OAuthException $e) {
print_r($e);
}

I was simply using the wrong oauth_token_secret, i should have used the one returned from the access_token not the request_token.

On another note the oauth_verifier is not needed when accessing the api endpoints.

Thats how the function ended up:

public function doshitAction(){

$params = array(
    'siteUrl' => 'http://www.appfactory.loc/magento/oauth',
    'requestTokenUrl' => 'http://www.appfactory.loc/magento/oauth/initiate',
    'accessTokenUrl' => 'http://www.appfactory.loc/magento/oauth/token',
    'consumerKey' => '531a7d194914fbd207766bcb022cdc94',
    'consumerSecret' => 'f51868e362b9211d4fde5ebf412080b0',
    'requestScheme' => Zend_Oauth::REQUEST_SCHEME_HEADER
);

// Initiate oAuth consumer
$consumer = new Zend_Oauth_Consumer($params);
// Using oAuth parameters and request Token we got, get access token
$acessToken = new Zend_Oauth_Token_Access;
$acessToken->setParams(array(
    'oauth_token' => 'e3d089e2b420cd3b940c3cf67587a95d',
    'oauth_token_secret' => 'ab2f46861defe6ee5740f7a748301367'
));


// do a request
$restClient = $acessToken->getHttpClient($params);
$restClient->setUri('http://www.appfactory.loc/magento/api/rest/products');
$restClient->setHeaders('Accept', 'application/json');
$restClient->setMethod(Zend_Http_Client::GET);
$response = $restClient->request();
// Here we can see that response body contains json list of products

return $response->getBody();


}