This may be too simple for you.
At the beginning, I was thinking like how the PSR works, what class should I add to config/app.php‘s provider (actually no need), etc.

Eventually I realised that, it was quite simple.

1. Edit the composer.json

Add "googleads/googleads-php-lib": "6.*" to the require section.

e.g.

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"require": {
    "php": ">=5.5.9",
    "laravel/framework": "5.1.*",
    "googleads/googleads-php-lib": "6.*"   <----------- this line
}

Then run the command:

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$ composer update

2. Create config file

By follow Laravel 5 standard, create a config file in the config folder

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project
├── config
│   ├── googleleads
│       └── adwords.ini

The adwords.ini contains:

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; Detailed descriptions of these properties can be found at:
; https://developers.google.com/adwords/api/docs/headers

developerToken = "INSERT_DEVELOPER_TOKEN_HERE"
userAgent = "INSERT_COMPANY_NAME_HERE"

; Uncomment clientCustomerId to make requests against a single AdWords account,
; such as when you run the examples.
; If you don't set it here, you can set the client customer ID dynamically:
;  $user = new AdWordsUser();
;  $user->SetClientCustomerId(...);

; clientCustomerId = "INSERT_CLIENT_CUSTOMER_ID_HERE"

[OAUTH2]

; If you do not have a client ID or secret, please create one of type
; "installed application" in the Google API console:
; https://cloud.google.com/console
client_id = "INSERT_OAUTH2_CLIENT_ID_HERE"
client_secret = "INSERT_OAUTH2_CLIENT_SECRET_HERE"

; If you already have a refresh token, enter it below. Otherwise run
; GetRefreshToken.php.
refresh_token = "INSERT_OAUTH2_REFRESH_TOKEN_HERE"

3. How to use

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<?php
Route::get('adwords', function () {
    $user = new AdWordsUser(config_path('googleads/adwords.ini'));
    print_r($user); // for debug only
    // other actions here
    return view('adwords');
});

That’s all~