IPN Failure

Hello,
Receiving an INVALID message from your IPN Url

Your Bitcoin Box : #19387
TxID: **Hidden** (order: gourlwoocommerce.order3585)
Your IPN Url: **Hidden**
It should return in plain text – ‘cryptobox_newrecord’ or ‘cryptobox_updated’ or ‘cryptobox_nochanges’ to GoUrl server only.
And in your browser you should see text – Only POST Data Allowed. See example.
Please check your website configuration / add our server IPs in white list. Instruction »

Your IPN Url has returned to our server, 2018-05-31 21:00:18 GMT –

——output start————

——output end————
Instant Payment Notification (IPN) allows you to integrate your GoUrl bitcoin payments with your website’s backend operations, so you get immediate notification and authentication of the bitcoin payments you receive.

I have verified that there is no CDN or IP Blocking setup

The page I need help with: [log in to see the link]