/**
* Create payload hash for message
*
* @param MessageInterface $message
*
* @return string
*
* @throws SendException
*/
public function createPayload(MessageInterface $message)
{
$payload = pack('CNNnH*', 1, $message->getIdentifier(), $message->getExpires()->format('U'), 32, $message->getDeviceToken());
$jsonData = $this->createJsonPayload($message);
$payloadSize = strlen($jsonData);
// Check payload size
if ($payloadSize > 2048) {
throw new SendException(SendException::ERROR_INVALID_PAYLOAD_SIZE, 1, $message->getIdentifier(), $message);
}
$payload .= pack('n', $payloadSize);
$payload .= $jsonData;
return $payload;
}
