curl --request POST \
  --url https://api.terminal49.com/v2/custom_field_definitions \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{}'

import requests

url = "https://api.terminal49.com/v2/custom_field_definitions"

payload = {}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({})
};

fetch('https://api.terminal49.com/v2/custom_field_definitions', 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.terminal49.com/v2/custom_field_definitions",
  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([
    
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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.terminal49.com/v2/custom_field_definitions"

	payload := strings.NewReader("{}")

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

	req.Header.Add("Authorization", "<api-key>")
	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.terminal49.com/v2/custom_field_definitions")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.terminal49.com/v2/custom_field_definitions")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{}"

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

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "type": "custom_field_definition",
    "attributes": {
      "entity_type": "Shipment",
      "api_slug": "<string>",
      "display_name": "<string>",
      "data_type": "short_text",
      "description": "<string>",
      "reference_type": "<string>",
      "validation": {},
      "default_format": "<string>",
      "default_value": "<string>",
      "reference_number": true,
      "sensitive": true,
      "inline_option_creation": true,
      "template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "has_data": true,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "discarded_at": "2023-11-07T05:31:56Z"
    },
    "relationships": {
      "account": {
        "data": {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "type": "account"
        }
      },
      "created_by": {
        "data": {
          "type": "user",
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
      },
      "options": {
        "data": [
          {
            "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "type": "custom_field_option"
          }
        ]
      }
    }
  },
  "links": {
    "self": "<string>"
  }
}

{
  "errors": [
    {
      "detail": "You are not allowed to perform this action"
    }
  ]
}

{
  "errors": [
    {
      "status": "422",
      "source": {
        "pointer": "/data/attributes/label"
      },
      "title": "Unprocessable Entity",
      "detail": "Label can't be blank",
      "code": "blank"
    }
  ]
}