Hi everyone,

I was reading the README file of the PHP package and here was what I
found out about the application token.

============
Basic usage
-----------

For those of you who have already built PHP clients without
using the client library, the AdWords class has methods for
setting username, password, client ID (clientEmail or
clientCustomerId),
application token, developer token, and useragent so that you
don't have to write the code to set the request headers. The methods
for
creating new instances of service classes takes the place of the code
for instantiating the stubs that connect to the web services.

In the following example, for using the default constructor,

  $user = new AdWordsUser();

the credentials are loaded from the "src/Google/Api/Ads/AdWords/
auth.ini" file.

The credentials can also be loaded in one of two ways: supplying an
alternative
authentication INI file or supplying credentials via the constructor's
parameters.

If an authentication INI file is provided and successfully loaded,
those
values will be used unless a corresponding parameter overwrites it.
If the authentication INI file is not provided (e.g. it is null)
the class will attempt to load the default authentication file at the
path
of "../auth.ini" relative to this file's directory. Any corresponding
parameter,
which is not null will however, overwrite any parameter loaded from
the default
INI.

  $user = new AdWordsUser(NULL, $email, $password, $developerToken,
      $applicationToken, $userAgent, $clientId);

  or

  // Used if the account is not using the MCC to log in.
  $user = new AdWordsUser(NULL, $email, $password, $developerToken,
      $applicationToken, $userAgent);
============

$user = new AdWordsUser(NULL, $email, $password, $developerToken,
$applicationToken, $userAgent, $clientId);

============

Question:

I don't have an application token and from what I have read on this
forum, it is no longer required. Does that mean I can leave the
$applicationToken field blank?

============

In the auth.ini file, you will see the following:

============
email = "INSERT_EMAIL_ADDRESS_HERE"
password = "INSERT_PASSWORD_HERE"
userAgent = "INSERT_COMPANY_NAME_HERE"
applicationToken = "INSERT_APPLICATION_TOKEN_HERE"
developerToken = "INSERT_DEVELOPER_TOKEN_HERE"
============

Question:

Do I leave the applicationToken field blank?

============

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