curl --request POST \
  --url https://demo.onlinebillingform.com/api/v2/vpn/servers/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 123,
  "country_id": 123,
  "server_name": "<string>",
  "ip_address": "127.0.0.1",
  "ssh_port": 123,
  "ssh_username": "<string>",
  "ssh_password_current": "<string>",
  "max_connection": 123,
  "vpn_type": 123,
  "ssh_password_new": "<string>",
  "vpn_port": "<string>",
  "vpn_custom_port": "<string>",
  "vpn_protocol": "<string>"
}
'

{
  "success": true
}