curl "https://app.tatango.com/api/v2/lists/<ID>/custom_field" -d '{"custom_field":{"label":"The Label","key":"the_key","content_type":"text","max_length":9999,"pattern":"[A-Za-z0-9]","should_validate_regex_via_api":false,"default_value":"The Default Value"}}' -X POST \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -u emailaddress@mydomain.com:my_api_key \
  -H "Host: example.org" \
  -H "Cookie: "

require 'net/http'
require 'uri'

uri = URI.parse('https://app.tatango.com/api/v2/lists/<ID>/custom_field')
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Post.new(uri.request_url)
request.basic_auth("emailaddress@mydomain.com", "my_api_key")
request.body = {"custom_field":{"label":"The Label","key":"the_key","content_type":"text","max_length":9999,"pattern":"[A-Za-z0-9]","should_validate_regex_via_api":false,"default_value":"The Default Value"}}.to_json
response = http.request(request)

var request = new XMLHttpRequest();
request.open('POST', 'https://app.tatango.com/api/v2/lists/<ID>/custom_field', false);
request.setRequestHeader('Content-Type', 'application/json');
request.setRequestHeader('Authorization', 'Basic ' + btoa('emailaddress@mydomain.com:my_api_key'));
var data = JSON.stringify({"custom_field":{"label":"The Label","key":"the_key","content_type":"text","max_length":9999,"pattern":"[A-Za-z0-9]","should_validate_regex_via_api":false,"default_value":"The Default Value"}});
request.send(data);

import requests

url = "https://app.tatango.com/api/v2/lists/{ID}/custom_field"

payload = { "custom_field": {
        "label": "The Label",
        "key": "the_key",
        "content_type": "text",
        "max_length": 9999,
        "pattern": "[A-Za-z0-9]",
        "should_validate_regex_via_api": False,
        "default_value": "The Default Value"
    } }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.tatango.com/api/v2/lists/{ID}/custom_field",
  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([
    'custom_field' => [
        'label' => 'The Label',
        'key' => 'the_key',
        'content_type' => 'text',
        'max_length' => 9999,
        'pattern' => '[A-Za-z0-9]',
        'should_validate_regex_via_api' => false,
        'default_value' => 'The Default Value'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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://app.tatango.com/api/v2/lists/{ID}/custom_field"

	payload := strings.NewReader("{\n  \"custom_field\": {\n    \"label\": \"The Label\",\n    \"key\": \"the_key\",\n    \"content_type\": \"text\",\n    \"max_length\": 9999,\n    \"pattern\": \"[A-Za-z0-9]\",\n    \"should_validate_regex_via_api\": false,\n    \"default_value\": \"The Default Value\"\n  }\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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://app.tatango.com/api/v2/lists/{ID}/custom_field")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"custom_field\": {\n    \"label\": \"The Label\",\n    \"key\": \"the_key\",\n    \"content_type\": \"text\",\n    \"max_length\": 9999,\n    \"pattern\": \"[A-Za-z0-9]\",\n    \"should_validate_regex_via_api\": false,\n    \"default_value\": \"The Default Value\"\n  }\n}")
  .asString();

{
  "status": "OK",
  "custom_field": {
    "list_id": 30,
    "key": "the_key",
    "pattern": "[A-Za-z0-9]",
    "max_length": 9999,
    "default_value": "The Default Value",
    "can_insert": true,
    "can_segment": true,
    "created_at": "2023-11-22T08:14:19.000-08:00",
    "updated_at": "2023-11-22T08:14:19.000-08:00",
    "mask": null,
    "label": "The Label",
    "content_type": "text",
    "should_validate_regex_via_api": false
  }
}

{
  "status": "error",
  "error": "Content type string not allowed. Allowed types are: text, datetime, number"
}