mailjet/mailjet-apiv3-php-simple — pull request #16 by vadim-skorba (2014-10-09 10:35:21+00:00)
Title: Update php-mailjet-v3-simple.class.php

Need to unset 'unique' parameter, otherwise it will not work and you'll get error like this:
stdClass::__set_state(array(
'ErrorInfo' => '',
'ErrorMessage' => 'Invalid json input: object ""->"TContactData" has no property "unique"',
'StatusCode' => 400,
))