curl --request PUT \
  --url https://api.sendpost.io/api/v1/account/ippool/{ippool_id} \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Marketing Promotional",
  "ips": [
    {
      "publicIP": "52.12.10.12"
    },
    {
      "publicIP": "52.10.12.17"
    },
    {
      "publicIP": "35.11.10.5"
    }
  ]
}
'

import requests

url = "https://api.sendpost.io/api/v1/account/ippool/{ippool_id}"

payload = {
    "name": "Marketing Promotional",
    "ips": [{ "publicIP": "52.12.10.12" }, { "publicIP": "52.10.12.17" }, { "publicIP": "35.11.10.5" }]
}
headers = {"Content-Type": "application/json"}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Marketing Promotional',
    ips: [{publicIP: '52.12.10.12'}, {publicIP: '52.10.12.17'}, {publicIP: '35.11.10.5'}]
  })
};

fetch('https://api.sendpost.io/api/v1/account/ippool/{ippool_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.sendpost.io/api/v1/account/ippool/{ippool_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'Marketing Promotional',
    'ips' => [
        [
                'publicIP' => '52.12.10.12'
        ],
        [
                'publicIP' => '52.10.12.17'
        ],
        [
                'publicIP' => '35.11.10.5'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.sendpost.io/api/v1/account/ippool/{ippool_id}"

	payload := strings.NewReader("{\n  \"name\": \"Marketing Promotional\",\n  \"ips\": [\n    {\n      \"publicIP\": \"52.12.10.12\"\n    },\n    {\n      \"publicIP\": \"52.10.12.17\"\n    },\n    {\n      \"publicIP\": \"35.11.10.5\"\n    }\n  ]\n}")

	req, _ := http.NewRequest("PUT", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.put("https://api.sendpost.io/api/v1/account/ippool/{ippool_id}")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Marketing Promotional\",\n  \"ips\": [\n    {\n      \"publicIP\": \"52.12.10.12\"\n    },\n    {\n      \"publicIP\": \"52.10.12.17\"\n    },\n    {\n      \"publicIP\": \"35.11.10.5\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sendpost.io/api/v1/account/ippool/{ippool_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Marketing Promotional\",\n  \"ips\": [\n    {\n      \"publicIP\": \"52.12.10.12\"\n    },\n    {\n      \"publicIP\": \"52.10.12.17\"\n    },\n    {\n      \"publicIP\": \"35.11.10.5\"\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "id": 756,
  "name": "Marketing Promotional",
  "created": 1567512491586102000,
  "ips": [
    {
      "id": 11429,
      "autoWarmupEnabled": true,
      "autoWarmupStage": 5,
      "publicIP": "52.12.10.12",
      "created": 1567512491588017700
    },
    {
      "id": 11530,
      "autoWarmupEnabled": true,
      "autoWarmupStage": 0,
      "publicIP": "52.10.12.17",
      "created": 1567512491568815400
    },
    {
      "id": 11531,
      "autoWarmupEnabled": true,
      "autoWarmupStage": 0,
      "publicIP": "35.11.10.5",
      "created": 1567512491568025300
    }
  ],
  "thirdPartySendingProviders": [],
  "routingStrategy": 0,
  "routingMetaData": "{}"
}