HTTP Code in PayPal response if Payal request verification server is not available

Question

PHP

Anyone who works with PayPal knows that in order to verify a payment, you need to make a request to the PayPal server and get a VERIFIED response if the payment is correct. If everything is OK, then the system returns the status 200 and PayPal considers the notification as successful.

Now the question is - if the verification request failed - cURL timeout or something systemic - what HTTP status would be correct to give for the PayPal notifier?

My option is to use HTTP code 503 Service Unavailable

Answer 1

As far as I remember, for Paypal everything that is not VERIFIED is an error by default. For certain errors, there are answers.