curl --request POST \
  --url https://{env}.tartanhq.com/api/external/oauth/token \
  --header 'Content-Type: multipart/form-data' \
  --form username=johndoe@example.com \
  --form password=mysecretpassword \
  --form grant_type=password

import requests

url = "https://{env}.tartanhq.com/api/external/oauth/token"

payload = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\njohndoe@example.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\nmysecretpassword\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"grant_type\"\r\n\r\npassword\r\n-----011000010111000001101001--"
headers = {"Content-Type": "multipart/form-data"}

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

print(response.text)

const form = new FormData();
form.append('username', 'johndoe@example.com');
form.append('password', 'mysecretpassword');
form.append('grant_type', 'password');

const options = {method: 'POST'};

options.body = form;

fetch('https://{env}.tartanhq.com/api/external/oauth/token', 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://{env}.tartanhq.com/api/external/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\njohndoe@example.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\nmysecretpassword\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"grant_type\"\r\n\r\npassword\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Content-Type: multipart/form-data"
  ],
]);

$response = curl_exec($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://{env}.tartanhq.com/api/external/oauth/token"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\njohndoe@example.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\nmysecretpassword\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"grant_type\"\r\n\r\npassword\r\n-----011000010111000001101001--")

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

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://{env}.tartanhq.com/api/external/oauth/token")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\njohndoe@example.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\nmysecretpassword\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"grant_type\"\r\n\r\npassword\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{env}.tartanhq.com/api/external/oauth/token")

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

request = Net::HTTP::Post.new(url)
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\njohndoe@example.com\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\nmysecretpassword\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"grant_type\"\r\n\r\npassword\r\n-----011000010111000001101001--"

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

{
  "access_token": "eyJhbGciOi...",
  "token_type": "bearer",
  "expires_in": 3600,
  "refresh_token": "eyJhbGciOi..."
}