GuzzleTest6.php

<?php

$client = new \GuzzleHttp\Client();

$headers = ['x-api-key' => 'MY API KEY'];

$options = [
            'headers' => ['x-api-key' => 'MY API KEY'],
            'debug' => true,
        ];
try {
	$resp = $client->request('GET', 'https://beta.check-mot.service.gov.uk',$options);

} catch (\GuzzleHttp\Exception\ClientException $e) {
	$resp = $e->getResponse();
}


echo $resp->getBody();

The URL in the request.

By using function?

public function apitest(){

$client = new \GuzzleHttp\Client();
$headers = ['x-api-key' => 'Key here'];

$options = [
'headers' => ['x-api-key' => 'Key here'],
'debug' => true,
];
try {
$resp = $client->request('GET', 'https://beta.check-mot.service.gov.uk/trade/vehicles/mot-tests\?registration=XX10ABC
',$options);
} catch (\GuzzleHttp\Exception\ClientException $e) {
$resp = $e->getResponse();
}
echo $resp->getBody();

}