curl --request POST \
  --url 'https://domain.hostwithdothost.com/?action=modifynameserver' \
  --header 'Content-Type: application/json' \
  --data '{
  "username": "yourUsername",
  "password": "yourPassword",
  "domain": "thegrtnx.com.ng",
  "nameservers": {
    "ns1": "aria.ns.cloudflare.com",
    "ns2": "garrett.ns.cloudflare.com"
  }
}'

{
  "data": {
    "NameServers": [
      "aria.ns.cloudflare.com",
      "garrett.ns.cloudflare.com"
    ]
  },
  "result": "OK"
}