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<?php

/**

Hi,

I'm working on a PHP client for the Google Measurement Protocol and building this based on Guzzle with service descriptions. I would like to know how to overwrite a required parameters through the client config. 

The service definition can be found here:
https://github.com/krizon/php-ga-measurement-protocol/blob/tid-config/src/Krizon/Google/Analytics/MeasurementProtocol/Resources/service.php

As you can see the is the 'tid' parameter that needs to be send with every request. I would like to offer users two ways to pass the 'tid' parameter:
- as parameter, see parameter.php below, 
OR
- as config value when creating the client, see config.php below;

It mostly works like expected but I want the 'tid' parameter to be required since it should included in every request. So i defined the 'tid' parameter to required but this results in an error when using the example of config.php.
To be more specific, this make the the test https://github.com/krizon/php-ga-measurement-protocol/blob/e3074b3af751ab4bad0f4cf9ee20dbc7db2afb8f/tests/Krizon/Google/Analytics/MeasurementProtocol/Test/MeasurementProtocolClientTest.php#L199 fail:
Guzzle\Service\Exception\ValidationException: Validation errors: [tid] is required;

How can one provide both ways to pass the 'tid' parameter and make the 'tid' parameter required?

Thanks!

config.php

<?php

// See https://github.com/krizon/php-ga-measurement-protocol/blob/e3074b3af751ab4bad0f4cf9ee20dbc7db2afb8f/src/Krizon/Google/Analytics/MeasurementProtocol/MeasurementProtocolClient.php
$client = MeasurementProtocolClient::factory(array(
    'tid' => 'XXXXXX'
));
$client->pageview(array(
    // ........
));

parameter.php

<?php

// Nothing special about this
$client = MeasurementProtocolClient::factory();
$client->pageview(array(
    'tid' => 'XXXXXX'
    // ........
));