No schema

gistfile1.php

<?php

/** ...Make the request, decode the response */

/** Check scan reference is present before we can use it */
if (!isset($decodedResponse->scanReference)) {
 	throw new \Exception("Invalid response - Scan Reference is missing");
}

if (!is_string($decodedResponse->scanReference)) {
	throw new \Exception("Invalid response - Scan Reference is not a string");
}

/** Check status is present before we can use it */
if (!isset($decodedResponse->status)) {
  throw new \Exception("Invalid response - Status is missing");
}

if (!is_string($decodedResponse->scanReference)) {
	throw new \Exception("Invalid response - Status is not a string");
}

/** Check dob is present and in the format we expect before we can use it */
$dob = null;
if (isset($decodedResponse->document->dob)) {
	if (!preg_match("/^[0-9]{4}-[0,1][0-9]-[0,1][0-9]$/", $decodedResponse->document->dob)) {
		throw new \Exception("DOB present but not in the expected format");
	}

	$dob = \DateTimeImmutable::createFromFormat('Y-m-d', $decodedResponse->document->dob);
}

/** ...continues for every other property we want to use */