chore: update Authorization to not use Bearer id

README.md

@@ -41,6 +41,16 @@ $client = new \OwenVoke\POAP\Client();
 $repositories = $client->event()->showBySlug('pest-php-meetup-1-2021');
 ```
 
+**Authentication**
+
+> Note: The POAP API only supports authentication via an API token.
+
+```php
+use OwenVoke\POAP\Client;
+$client = new Client();
+$client->authenticate($apiToken, null, Client::AUTH_ACCESS_TOKEN);
+```
+
 ## Change log
 
 Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.

src/HttpClient/Plugin/Authentication.php

@@ -43,7 +43,7 @@ private function getAuthorizationHeader(): string
     {
         switch ($this->method) {
             case Client::AUTH_ACCESS_TOKEN:
-                return sprintf('Bearer %s', $this->tokenOrLogin);
+                return $this->tokenOrLogin;
             default:
                 throw new RuntimeException(sprintf('%s not yet implemented', $this->method));
         }