Laravel 5.1 Guzzle - Undefined offset: 0 - api

Question

I need to access an API so I use guzzle6 and I write a function:
public function test()
{
$client = new GuzzleHttp\Client(['defaults' => ['verify' => false]]);
try {
$res = $client->post('https://example.com/api/v2/oauth/token?grant_type=client_credentials', [
'headers' => [
'Content-Type' => 'application/x-www-form-urlencoded',
],
'auth' => [
'Username' => 'user_5639',
'Password' => 'pass_asdhbas67yausihd7qaw8'
]
]);
$res = json_decode($res->getBody()->getContents(), true);
}
catch (GuzzleHttp\Exception\ClientException $e) {
$response = $e->getResponse();
$result = json_decode($response->getBody()->getContents());
return response()->json(['data' => $result]);
}
}
but I got error:
ErrorException in Client.php line 346: Undefined offset: 0
When I try at POSTMAN the same request everything is fine:
How to solve my problem?

Answer 1

If you have a look at the Guzzle Manual for the auth-option, you'll see it expects a numerically indexed array, with the username on index 0 and the password on index 1.
So this should work:
$res = $client->post('https://example.com/api/v2/oauth/token?grant_type=client_credentials', [
'headers' => [
'Content-Type' => 'application/x-www-form-urlencoded',
],
'auth' => [
'user_xxxx', 'pass_xxxxx'
]
]);