### Install mailXpert PHP SDK with Composer

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Install the mailXpert PHP SDK using Composer. This is the recommended method for managing dependencies.

```bash
composer require mailxpert/php-sdk
```

--------------------------------

### Perform API Request with Access Token

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Make a GET request to the '/contact_lists' endpoint using a provided access token. The response is JSON decoded.

```php
$data = json_decode($mailxpert->sendRequest('GET','/contact_lists',[], $accessToken), true);
$contactLists = $data['data'];
```

--------------------------------

### Perform API Request after Setting Access Token

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Make a GET request to the '/contact_lists' endpoint after setting the access token globally. No token parameter is needed.

```php
$mailxpert->sendRequest('GET','/contact_lists');
```

--------------------------------

### Initialize Mailxpert SDK

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Initialize the Mailxpert SDK with your application's credentials. Ensure you have your appId and appSecret.

```php
$mailxpert = new Mailxpert([
    'app_id' => $appId,
    'app_secret' => $appSecret 
]);
```

--------------------------------

### Display 'Login with mailXpert' Button

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Generate a link to initiate the OAuth login flow with mailXpert. The redirectUrl parameter is required.

```php
<a href="<?php echo $mailxpert->getLoginHelper()->getLoginUrl($redirectUrl); ?>">Login with mailXpert</a>
```

--------------------------------

### Set Access Token for Subsequent Requests

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Set a persistent access token for the Mailxpert instance. This avoids passing the token with every request.

```php
$mailxpert->setAccessToken($access_token);
```

--------------------------------

### Retrieve Access Token after Login

Source: https://github.com/mailxpert/mailxpert-php-sdk/blob/master/README.md

Obtain the access token after a successful user login. This code should be placed on the redirect URL page.

```php
if (isset($_REQUEST['code'])) {
    $accessToken = $mailxpert->getLoginHelper()->getAccessToken($redirectUrl);
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.