SOLVED – API Token Request Curl Returns NULL in Magento 2

Creating and using rest api in magento 2 is very easy but for that you need some startup example.Magento 2 uses token based rest api.First you need to authenticate user and get the token from magento 2.After getting token you have to pass this token to every request you performed.For example to get product details by SKU you need to first authenticate user and get token now pass this token to your header to call web service /V1/products/:sku

Here I have created example for get product by SKU using magento 2 rest api.Here is list of API that supported by magento 2. LIST OF Methods REST API MAGENTO 2

Below Example please follow

Magento 2 REST API Authentication

//Authentication rest API magento2.Please change url accordingly your url
$adminUrl='http://127.0.0.1/magento2/index.php/rest/V1/integration/admin/token';
$ch = curl_init();
$data = array("username" => "wsuser", "password" => "password123");                                                                    
$data_string = json_encode($data);                       
$ch = curl_init($adminUrl); 
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");                                                                     
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);                                                                  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                                                                      
curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                                                          
    'Content-Type: application/json',                                                                                
    'Content-Length: ' . strlen($data_string))                                                                       
);       
$token = curl_exec($ch);
$token=  json_decode($token);                                                
Get Product By SKU REST API Magento 2

//Use above token into header
$headers = array("Authorization: Bearer $token"); 

$requestUrl='http://127.0.0.1/magento2/index.php/rest/V1/products/24-MB01';
//Please note 24-MB01 is sku

$ch = curl_init();
$ch = curl_init($requestUrl); 
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);   

$result = curl_exec($ch);
$result=  json_decode($result);
print_r($result);

Try to do this code which is quite similar:

//API URL
$url = 'http://mywebsite/rest/V1/integration/admin/token';

//create a new cURL resource
$ch = curl_init($url);

//setup request to send json via POST
$data = array(
    'username' => '.....',
    'password' => '.....'
);
$payload = json_encode(array("user" => $data));

//attach encoded JSON string to the POST fields
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);

//set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json'));

//return response instead of outputting
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

//execute the POST request
$result = curl_exec($ch);

//close cURL resource
curl_close($ch);

You can try also to follow the redirect :

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

You can also add these lines in order to debug your CURL request in a custom file.

curl_setopt($handle, CURLOPT_VERBOSE, true);

$verbose = fopen('/tmp/curl.log', 'w+');
curl_setopt($handle, CURLOPT_STDERR, $verbose);

Moreover, first try to test you API thanks to Postman or other software to know if the problem is on the curl / php side.

What is your webserver ? Apache / Nginx ? Do you use the default Magento 2 configuration ?