curl --request POST \
  --url https://{tenant_domain}/third-party/v1/conversations/{conversationId}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "<string>",
  "reference_id": 123,
  "from_automation": false,
  "text": {
    "content": "<string>"
  },
  "image": {
    "caption": "<string>"
  },
  "video": {
    "caption": "<string>"
  },
  "audio": {
    "voice": true
  },
  "document": {
    "filename": "<string>",
    "caption": "<string>"
  },
  "location": {
    "latitude": "<string>",
    "longitude": "<string>",
    "remaining_fields": "See location schema."
  },
  "contact": {
    "name": {
      "formatted_name": "<string>"
    },
    "remaining_fields": "See contact schema."
  },
  "file": {
    "url": "<string>",
    "internal_uuid": "<string>"
  }
}
'

import requests

url = "https://{tenant_domain}/third-party/v1/conversations/{conversationId}/messages"

payload = {
    "type": "<string>",
    "reference_id": 123,
    "from_automation": False,
    "text": { "content": "<string>" },
    "image": { "caption": "<string>" },
    "video": { "caption": "<string>" },
    "audio": { "voice": True },
    "document": {
        "filename": "<string>",
        "caption": "<string>"
    },
    "location": {
        "latitude": "<string>",
        "longitude": "<string>",
        "remaining_fields": "See location schema."
    },
    "contact": {
        "name": { "formatted_name": "<string>" },
        "remaining_fields": "See contact schema."
    },
    "file": {
        "url": "<string>",
        "internal_uuid": "<string>"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    type: '<string>',
    reference_id: 123,
    from_automation: false,
    text: {content: '<string>'},
    image: {caption: '<string>'},
    video: {caption: '<string>'},
    audio: {voice: true},
    document: {filename: '<string>', caption: '<string>'},
    location: {
      latitude: '<string>',
      longitude: '<string>',
      remaining_fields: 'See location schema.'
    },
    contact: {name: {formatted_name: '<string>'}, remaining_fields: 'See contact schema.'},
    file: {url: '<string>', internal_uuid: '<string>'}
  })
};

fetch('https://{tenant_domain}/third-party/v1/conversations/{conversationId}/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://{tenant_domain}/third-party/v1/conversations/{conversationId}/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([
    'type' => '<string>',
    'reference_id' => 123,
    'from_automation' => false,
    'text' => [
        'content' => '<string>'
    ],
    'image' => [
        'caption' => '<string>'
    ],
    'video' => [
        'caption' => '<string>'
    ],
    'audio' => [
        'voice' => true
    ],
    'document' => [
        'filename' => '<string>',
        'caption' => '<string>'
    ],
    'location' => [
        'latitude' => '<string>',
        'longitude' => '<string>',
        'remaining_fields' => 'See location schema.'
    ],
    'contact' => [
        'name' => [
                'formatted_name' => '<string>'
        ],
        'remaining_fields' => 'See contact schema.'
    ],
    'file' => [
        'url' => '<string>',
        'internal_uuid' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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://{tenant_domain}/third-party/v1/conversations/{conversationId}/messages"

	payload := strings.NewReader("{\n  \"type\": \"<string>\",\n  \"reference_id\": 123,\n  \"from_automation\": false,\n  \"text\": {\n    \"content\": \"<string>\"\n  },\n  \"image\": {\n    \"caption\": \"<string>\"\n  },\n  \"video\": {\n    \"caption\": \"<string>\"\n  },\n  \"audio\": {\n    \"voice\": true\n  },\n  \"document\": {\n    \"filename\": \"<string>\",\n    \"caption\": \"<string>\"\n  },\n  \"location\": {\n    \"latitude\": \"<string>\",\n    \"longitude\": \"<string>\",\n    \"remaining_fields\": \"See location schema.\"\n  },\n  \"contact\": {\n    \"name\": {\n      \"formatted_name\": \"<string>\"\n    },\n    \"remaining_fields\": \"See contact schema.\"\n  },\n  \"file\": {\n    \"url\": \"<string>\",\n    \"internal_uuid\": \"<string>\"\n  }\n}")

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

	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://{tenant_domain}/third-party/v1/conversations/{conversationId}/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"type\": \"<string>\",\n  \"reference_id\": 123,\n  \"from_automation\": false,\n  \"text\": {\n    \"content\": \"<string>\"\n  },\n  \"image\": {\n    \"caption\": \"<string>\"\n  },\n  \"video\": {\n    \"caption\": \"<string>\"\n  },\n  \"audio\": {\n    \"voice\": true\n  },\n  \"document\": {\n    \"filename\": \"<string>\",\n    \"caption\": \"<string>\"\n  },\n  \"location\": {\n    \"latitude\": \"<string>\",\n    \"longitude\": \"<string>\",\n    \"remaining_fields\": \"See location schema.\"\n  },\n  \"contact\": {\n    \"name\": {\n      \"formatted_name\": \"<string>\"\n    },\n    \"remaining_fields\": \"See contact schema.\"\n  },\n  \"file\": {\n    \"url\": \"<string>\",\n    \"internal_uuid\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{tenant_domain}/third-party/v1/conversations/{conversationId}/messages")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"type\": \"<string>\",\n  \"reference_id\": 123,\n  \"from_automation\": false,\n  \"text\": {\n    \"content\": \"<string>\"\n  },\n  \"image\": {\n    \"caption\": \"<string>\"\n  },\n  \"video\": {\n    \"caption\": \"<string>\"\n  },\n  \"audio\": {\n    \"voice\": true\n  },\n  \"document\": {\n    \"filename\": \"<string>\",\n    \"caption\": \"<string>\"\n  },\n  \"location\": {\n    \"latitude\": \"<string>\",\n    \"longitude\": \"<string>\",\n    \"remaining_fields\": \"See location schema.\"\n  },\n  \"contact\": {\n    \"name\": {\n      \"formatted_name\": \"<string>\"\n    },\n    \"remaining_fields\": \"See contact schema.\"\n  },\n  \"file\": {\n    \"url\": \"<string>\",\n    \"internal_uuid\": \"<string>\"\n  }\n}"

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

{
  "data": {
    "id": 123,
    "conversation_id": 123,
    "user_id": 123,
    "contents": [
      "<unknown>"
    ],
    "agent_reaction": "<string>",
    "customer_reaction": "<string>",
    "sent_at": "2023-01-01T12:00:00Z",
    "reference": {},
    "latest_error": {
      "id": 123,
      "message_id": 123,
      "original_message": "<string>",
      "user_friendly_message": "<string>",
      "created_at": "2023-01-01T12:00:00Z"
    },
    "wa_template_id": 123,
    "wa_flow_id": 123
  }
}