curl --request POST \
  --url https://{dsn}/api/v1/drafts \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "account_id": "acc_ba1fa6938d8548298e8ce62e4b4b4e99",
  "to": [
    {
      "identifier": "ana@example.com"
    }
  ],
  "subject": "Draft proposal",
  "body": "<p>First version</p>"
}
'

import requests

url = "https://{dsn}/api/v1/drafts"

payload = {
    "account_id": "acc_ba1fa6938d8548298e8ce62e4b4b4e99",
    "to": [{ "identifier": "ana@example.com" }],
    "subject": "Draft proposal",
    "body": "<p>First version</p>"
}
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    account_id: 'acc_ba1fa6938d8548298e8ce62e4b4b4e99',
    to: [{identifier: 'ana@example.com'}],
    subject: 'Draft proposal',
    body: JSON.stringify('<p>First version</p>')
  })
};

fetch('https://{dsn}/api/v1/drafts', 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://{dsn}/api/v1/drafts",
  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([
    'account_id' => 'acc_ba1fa6938d8548298e8ce62e4b4b4e99',
    'to' => [
        [
                'identifier' => 'ana@example.com'
        ]
    ],
    'subject' => 'Draft proposal',
    'body' => '<p>First version</p>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <api-key>"
  ],
]);

$response = curl_exec($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://{dsn}/api/v1/drafts"

	payload := strings.NewReader("{\n  \"account_id\": \"acc_ba1fa6938d8548298e8ce62e4b4b4e99\",\n  \"to\": [\n    {\n      \"identifier\": \"ana@example.com\"\n    }\n  ],\n  \"subject\": \"Draft proposal\",\n  \"body\": \"<p>First version</p>\"\n}")

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

	req.Header.Add("X-API-KEY", "<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://{dsn}/api/v1/drafts")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"account_id\": \"acc_ba1fa6938d8548298e8ce62e4b4b4e99\",\n  \"to\": [\n    {\n      \"identifier\": \"ana@example.com\"\n    }\n  ],\n  \"subject\": \"Draft proposal\",\n  \"body\": \"<p>First version</p>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{dsn}/api/v1/drafts")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"account_id\": \"acc_ba1fa6938d8548298e8ce62e4b4b4e99\",\n  \"to\": [\n    {\n      \"identifier\": \"ana@example.com\"\n    }\n  ],\n  \"subject\": \"Draft proposal\",\n  \"body\": \"<p>First version</p>\"\n}"

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

{
  "object": "DraftCreated",
  "account_id": "acc_ba1fa6938d8548298e8ce62e4b4b4e99",
  "draft_id": "drf_AAMkAGI2THVSAAA=",
  "message_id": "5b1c2d3e4f6a47b8@mail-api.example.com",
  "tracking_id": null
}

{
  "status": 400,
  "type": "errors/invalid_parameters",
  "title": "Invalid parameters",
  "detail": "limit must be between 1 and 250"
}

{
  "status": 401,
  "type": "errors/invalid_credentials",
  "title": "Invalid credentials",
  "detail": "the mail provider rejected the credentials: invalid_grant"
}

{
  "status": 502,
  "type": "errors/provider_error",
  "title": "Mail provider error",
  "detail": "timed out talking to imap.example.com"
}