curl --request POST \
  --url https://order.edisglobal.com/kvm/v2/cancel/product \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data email=yourwhmc_email \
  --data pw=yourwhmcs_password \
  --data kvmid=kvm_xxxxx_yyyyy \
  --data serviceid=1234 \
  --data 'type=End of Billing Period'

{
  "status": "success",
  "serviceid": 123456,
  "clientid": 123
}