curl --request POST \
  --url https://order.edisglobal.com/kvm/v2/get/billingcycles \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data email=yourwhmc_email \
  --data pw=yourwhmcs_password

{
  "billingcycle": [
    "monthly",
    "quarterly",
    "semiannually",
    "annually"
  ],
  "status": "success"
}