protected function getCommonPart()
    {
        $environment = $this->config->getEnvironment();
        $pluginSettings = $this->config->getPluginSettings();

        // Complete message with values common to all API calls:
        // - contract part
        // - format part
        // - environment part
        $commonMessagePart = array(
            'contract' => $this->config->getCredentials(),
            'format' => $pluginSettings['outputFormat'],
            'testmode' => $pluginSettings['debug'] === PluginConfig::Send_TestMode ? Api::TestMode_Test : Api::TestMode_Normal,
            'connector' => array(
                'application' => "{$environment['shopName']} {$environment['shopVersion']}",
                'webkoppel' => "Acumulus {$environment['moduleVersion']}",
                'development' => 'SIEL - Buro RaDer',
                'remark' => "Library {$environment['libraryVersion']} - PHP {$environment['phpVersion']}",
                'sourceuri' => 'https://www.siel.nl/',
            ),
        );
        return $commonMessagePart;
    }