curl --request POST \
  --url https://api.{tenant}.getomneo.com/api/v3/countries \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "iso_2": "<string>",
  "iso_3": "<string>",
  "iso_numeric": "<string>",
  "sort_order": 123,
  "currency": "<string>",
  "states": [
    {
      "name": "<string>",
      "type": "<string>",
      "iso": "<string>",
      "iso_2_country": "<string>",
      "iso_2_country_state_code": "<string>",
      "sort_order": 123
    }
  ]
}
'

import requests

url = "https://api.{tenant}.getomneo.com/api/v3/countries"

payload = {
    "name": "<string>",
    "iso_2": "<string>",
    "iso_3": "<string>",
    "iso_numeric": "<string>",
    "sort_order": 123,
    "currency": "<string>",
    "states": [
        {
            "name": "<string>",
            "type": "<string>",
            "iso": "<string>",
            "iso_2_country": "<string>",
            "iso_2_country_state_code": "<string>",
            "sort_order": 123
        }
    ]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: '<string>',
    iso_2: '<string>',
    iso_3: '<string>',
    iso_numeric: '<string>',
    sort_order: 123,
    currency: '<string>',
    states: [
      {
        name: '<string>',
        type: '<string>',
        iso: '<string>',
        iso_2_country: '<string>',
        iso_2_country_state_code: '<string>',
        sort_order: 123
      }
    ]
  })
};

fetch('https://api.{tenant}.getomneo.com/api/v3/countries', 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.{tenant}.getomneo.com/api/v3/countries",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => '<string>',
    'iso_2' => '<string>',
    'iso_3' => '<string>',
    'iso_numeric' => '<string>',
    'sort_order' => 123,
    'currency' => '<string>',
    'states' => [
        [
                'name' => '<string>',
                'type' => '<string>',
                'iso' => '<string>',
                'iso_2_country' => '<string>',
                'iso_2_country_state_code' => '<string>',
                'sort_order' => 123
        ]
    ]
  ]),
  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.{tenant}.getomneo.com/api/v3/countries"

	payload := strings.NewReader("{\n  \"name\": \"<string>\",\n  \"iso_2\": \"<string>\",\n  \"iso_3\": \"<string>\",\n  \"iso_numeric\": \"<string>\",\n  \"sort_order\": 123,\n  \"currency\": \"<string>\",\n  \"states\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"iso\": \"<string>\",\n      \"iso_2_country\": \"<string>\",\n      \"iso_2_country_state_code\": \"<string>\",\n      \"sort_order\": 123\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", 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.post("https://api.{tenant}.getomneo.com/api/v3/countries")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"<string>\",\n  \"iso_2\": \"<string>\",\n  \"iso_3\": \"<string>\",\n  \"iso_numeric\": \"<string>\",\n  \"sort_order\": 123,\n  \"currency\": \"<string>\",\n  \"states\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"iso\": \"<string>\",\n      \"iso_2_country\": \"<string>\",\n      \"iso_2_country_state_code\": \"<string>\",\n      \"sort_order\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.{tenant}.getomneo.com/api/v3/countries")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"<string>\",\n  \"iso_2\": \"<string>\",\n  \"iso_3\": \"<string>\",\n  \"iso_numeric\": \"<string>\",\n  \"sort_order\": 123,\n  \"currency\": \"<string>\",\n  \"states\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"iso\": \"<string>\",\n      \"iso_2_country\": \"<string>\",\n      \"iso_2_country_state_code\": \"<string>\",\n      \"sort_order\": 123\n    }\n  ]\n}"

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

{
  "data": {
    "id": 123,
    "name": "<string>",
    "iso_2": "<string>",
    "iso_3": "<string>",
    "iso_numeric": "<string>",
    "sort_order": 123,
    "states": [
      {
        "id": 123,
        "name": "<string>",
        "type": "<string>",
        "iso": "<string>",
        "iso_2_country": "<string>",
        "iso_2_country_state_code": "<string>",
        "sort_order": 123,
        "created_at": "<string>",
        "updated_at": "<string>"
      }
    ],
    "currency": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>",
    "region": {
      "id": "<string>",
      "name": "<string>",
      "handle": "<string>",
      "is_default": "<string>"
    }
  }
}

{
  "message": "<string>"
}

{
  "message": "<string>"
}

{
  "message": "<string>",
  "errors": {}
}