curl --request POST \
  --url https://api.relayapp.im/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "conversation_id": "cnv_01JZC7K4RQ",
  "parts": [
    {
      "type": "text",
      "text": "Tomorrow at 2:00 PM works."
    }
  ],
  "reply_to": {
    "message_id": "msg_01JZM3T8AH",
    "part_index": 0
  },
  "draft": true
}
'

import requests

url = "https://api.relayapp.im/v1/messages"

payload = {
    "conversation_id": "cnv_01JZC7K4RQ",
    "parts": [
        {
            "type": "text",
            "text": "Tomorrow at 2:00 PM works."
        }
    ],
    "reply_to": {
        "message_id": "msg_01JZM3T8AH",
        "part_index": 0
    },
    "draft": True
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    conversation_id: 'cnv_01JZC7K4RQ',
    parts: [{type: 'text', text: 'Tomorrow at 2:00 PM works.'}],
    reply_to: {message_id: 'msg_01JZM3T8AH', part_index: 0},
    draft: true
  })
};

fetch('https://api.relayapp.im/v1/messages', 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.relayapp.im/v1/messages",
  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([
    'conversation_id' => 'cnv_01JZC7K4RQ',
    'parts' => [
        [
                'type' => 'text',
                'text' => 'Tomorrow at 2:00 PM works.'
        ]
    ],
    'reply_to' => [
        'message_id' => 'msg_01JZM3T8AH',
        'part_index' => 0
    ],
    'draft' => true
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-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://api.relayapp.im/v1/messages"

	payload := strings.NewReader("{\n  \"conversation_id\": \"cnv_01JZC7K4RQ\",\n  \"parts\": [\n    {\n      \"type\": \"text\",\n      \"text\": \"Tomorrow at 2:00 PM works.\"\n    }\n  ],\n  \"reply_to\": {\n    \"message_id\": \"msg_01JZM3T8AH\",\n    \"part_index\": 0\n  },\n  \"draft\": true\n}")

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

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("Authorization", "Bearer <token>")
	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.relayapp.im/v1/messages")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"conversation_id\": \"cnv_01JZC7K4RQ\",\n  \"parts\": [\n    {\n      \"type\": \"text\",\n      \"text\": \"Tomorrow at 2:00 PM works.\"\n    }\n  ],\n  \"reply_to\": {\n    \"message_id\": \"msg_01JZM3T8AH\",\n    \"part_index\": 0\n  },\n  \"draft\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.relayapp.im/v1/messages")

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

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"conversation_id\": \"cnv_01JZC7K4RQ\",\n  \"parts\": [\n    {\n      \"type\": \"text\",\n      \"text\": \"Tomorrow at 2:00 PM works.\"\n    }\n  ],\n  \"reply_to\": {\n    \"message_id\": \"msg_01JZM3T8AH\",\n    \"part_index\": 0\n  },\n  \"draft\": true\n}"

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

{
  "message_id": "msg_01JZM4Q9VN",
  "message": {
    "id": "msg_01JZM3T8AH",
    "conversation_id": "cnv_01JZC7K4RQ",
    "sequence": 123,
    "sender": {
      "id": "usr_01JZU1F0BD"
    },
    "parts": [
      {
        "part_index": 123,
        "text": "<string>",
        "url": "<string>",
        "attachment_id": "<string>",
        "data": {}
      }
    ],
    "fallback_text": "<string>",
    "status": "sent",
    "created_at": "2023-11-07T05:31:56Z",
    "reply_to": {
      "message_id": "msg_01JZM3T8AH",
      "part_index": 0
    }
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "conversation_id is required"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "conversation_id is required"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "conversation_id is required"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "conversation_id is required"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "conversation_id is required"
  }
}