/**
* @param string $sender
* @param string $message
* @param array $receivers
* @return mixed|null
*/
public function sendMessage($sender, $message, array $receivers)
{
if (!is_string($sender)) {
throw new \InvalidArgumentException(sprintf('Sender has to be a string, got "%s"', gettype($sender)), self::ERROR_SEND_MESSAGE_INVALID_SENDER);
}
$receivers = array_diff(array_unique(array_map('trim', $receivers)), ['']);
if (!count($receivers)) {
throw new \InvalidArgumentException('Define at least one receiver.', self::ERROR_SEND_MESSAGE_NO_RECEIVERS);
}
$data = ['receivers' => $receivers, 'message' => is_string($message) ? $message : json_encode($message), 'sender' => $sender];
return $this->apiConnector->getData('send-message', $data);
}
