Below is the failure emails we are getting:
Our systems have detected that your callback has failed.
This callback failure means we were unable to pass information
to your server about the following transaction:
Transaction ID: 3108598768
Cart ID: 29642
Installation ID: 1066692
Error reported: Callback to: https://www.derougemontmanor.com/wc-api/woocommerce_worldpay: failed CAUSED BY Received fatal alert: handshake_failure
Server Reference: ukdc1-pz-cen09:callbackFailureEmail-1069:MerchReq-686-67
Also, if you usually return a response page for us to display to the Shopper
within the time allowed (1 minute), this will not have been displayed.
WorldPay will have displayed to the Shopper the response page file
(resultY.html or resultC.html) held for your installation on the WorldPay
server. This will be your own custom version, if you have supplied one, or,
if not, the WorldPay default version.
This is the attachment to the email:
POST /wc-api/woocommerce_worldpay?msgType=authResult&installation=1066692 HTTP/1.0
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
User-Agent: WJHRO/1.0 (WorldPay Java HTTP Request Object)