Getting the statistics with the default parameters...
object(stdClass)#5 (2) {
  ["Code"]=>
  int(100)
  ["Message"]=>
  string(15) "Invalid API Key"
}

Getting the statistics, filtered to a classic group...
object(stdClass)#7 (2) {
  ["Code"]=>
  int(100)
  ["Message"]=>
  string(15) "Invalid API Key"
}

Getting the statistics, filtered to a smart email...
object(stdClass)#6 (2) {
  ["Code"]=>
  int(100)
  ["Message"]=>
  string(15) "Invalid API Key"
}

Getting the most recent sent messages...
<br />
<b>Fatal error</b>:  Cannot use object of type stdClass as array in <b>/home/wcthpgmy/public_html/vendor/campaignmonitor/createsend-php-master/samples/transactional/timeline.php</b> on line <b>36</b><br />