What are the common reasons for receiving an "Unauthorized" error when trying to access the N26 API using PHP?

The common reasons for receiving an "Unauthorized" error when trying to access the N26 API using PHP are incorrect authentication credentials, expired access tokens, or insufficient permissions. To solve this issue, make sure you are using the correct API key and secret, ensure your access token is still valid, and verify that your account has the necessary permissions to access the requested resources. 

// Sample code to authenticate and make a request to the N26 API
$api_key = 'YOUR_API_KEY';
$api_secret = 'YOUR_API_SECRET';
$access_token = 'YOUR_ACCESS_TOKEN';

$ch = curl_init('https://api.tech26.de/oauth2/token');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Authorization: Basic ' . base64_encode($api_key . ':' . $api_secret),
    'Content-Type: application/x-www-form-urlencoded'
));
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
    'grant_type' => 'client_credentials'
)));

$response = curl_exec($ch);
curl_close($ch);

$access_token = json_decode($response)->access_token;

// Make a request to the N26 API using the access token
$ch = curl_init('https://api.tech26.de/v1/endpoint');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Authorization: Bearer ' . $access_token
));

$response = curl_exec($ch);
curl_close($ch);

// Process the API response
echo $response;

Keywords

N26 API PHP Unauthorized error Authentication Authorization

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