oAuth 2 — Get your Office 365 token in Laravel

With the following code sample you can retrieve an oAuth 2 token for your Microsoft account. This is specifically for the Credentials Grant authorization flow.

If you want to learn more about the available flows oAuth 2 has, I recommend this article by Athiththan Kathirgamasegaran.

Microsoft supports 3 flows, you can read more about them here.

$tennantId = '<tennant-id>';
$scope = 'https://ps.outlook.com/.default';
$redirectUrl = 'https://callbackurl';
$appId = '<app-id>';
$secretId = '<secret-id>';
$secret = '<secret>';
$url = "https://login.microsoftonline.com/{$tennantId}/oauth2/v2.0/token?scope={$scope}&client_id={$secretId}&redirect_uri={$redirectUrl}";

$config = [
    'grant_type' => 'client_credentials',
    'client_id' => $appId,
    'client_secret' => $secret,
    'scope' => $scope,
];

$response = \Illuminate\Support\Facades\Http::asForm()->post($url, $config);

$data = $response->json();

\Illuminate\Support\Facades\Log::info('server error: ' . $response->serverError());
\Illuminate\Support\Facades\Log::info('server error: ' . $response->body());
\Illuminate\Support\Facades\Log::info('server error: ' . $response->status());

$token = \Illuminate\Support\Arr::get($data, 'access_token');
$expiresOn = \Illuminate\Support\Arr::get($data, 'expires_on');
$tokenType = \Illuminate\Support\Arr::get($data, 'token_type');
$expiresIn = \Illuminate\Support\Arr::get($data, 'expires_in');
$expExpiresIn = \Illuminate\Support\Arr::get($data, 'ext_expires_in');

\Illuminate\Support\Facades\Log::info("Token: {$token}");

I this sample I use a scope for retrieving e-mails. Depending on the data you are working with you need a specific scope.

Microsoft can be a bit awkward concerning naming parameters and stuff. In this case you need to provide the app-id as the client-id. This is probably because the app you need to create acts as the client.