You should show your code from postman.
This might help you.
curl http://example.com -X post --header 'Content-Type:application/json' -d '{"No":"893049193012","Id":"test_1","Token":"jkkhsjkhfkeiuryi"}'
The above converts to:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'post');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'Content-Type' => 'application/json',
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, '{"No":"893049193012","Id":"test_1","Token":"jkkhsjkhfkeiuryi"}');
$response = curl_exec($ch);
When you send JSON in the post data, you need the Content-Type => application/json in the request header.