curl --request POST \
  --url https://integration.getmateo.com/api/v1/send_message \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "from": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "conversation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "to": [
    {
      "handle": "<string>",
      "country_codes": [
        "<string>"
      ],
      "full_name": "<string>",
      "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "external_contact_id": "<string>",
      "secondary_external_contact_id": "<string>"
    }
  ],
  "cc": [
    {
      "handle": "<string>",
      "country_codes": [
        "<string>"
      ],
      "full_name": "<string>",
      "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "external_contact_id": "<string>",
      "secondary_external_contact_id": "<string>"
    }
  ],
  "bcc": [
    {
      "handle": "<string>",
      "country_codes": [
        "<string>"
      ],
      "full_name": "<string>",
      "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "external_contact_id": "<string>",
      "secondary_external_contact_id": "<string>"
    }
  ],
  "subject": "<string>",
  "html": "<string>",
  "text": "<string>",
  "content": {},
  "send_after": "2023-11-07T05:31:56Z",
  "placeholder_values": [
    "<string>"
  ],
  "reply_to_message_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "attachments": [
    "<string>"
  ],
  "template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "review_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "marketing_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "actions": [
    {
      "text": "<string>",
      "data": "<string>"
    }
  ],
  "footer": "<string>"
}
'

import requests

url = "https://integration.getmateo.com/api/v1/send_message"

payload = {
    "from": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "conversation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "to": [
        {
            "handle": "<string>",
            "country_codes": ["<string>"],
            "full_name": "<string>",
            "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "external_contact_id": "<string>",
            "secondary_external_contact_id": "<string>"
        }
    ],
    "cc": [
        {
            "handle": "<string>",
            "country_codes": ["<string>"],
            "full_name": "<string>",
            "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "external_contact_id": "<string>",
            "secondary_external_contact_id": "<string>"
        }
    ],
    "bcc": [
        {
            "handle": "<string>",
            "country_codes": ["<string>"],
            "full_name": "<string>",
            "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "external_contact_id": "<string>",
            "secondary_external_contact_id": "<string>"
        }
    ],
    "subject": "<string>",
    "html": "<string>",
    "text": "<string>",
    "content": {},
    "send_after": "2023-11-07T05:31:56Z",
    "placeholder_values": ["<string>"],
    "reply_to_message_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "attachments": ["<string>"],
    "template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "review_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "marketing_channel_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "actions": [
        {
            "text": "<string>",
            "data": "<string>"
        }
    ],
    "footer": "<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({
    from: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    conversation_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    to: [
      {
        handle: '<string>',
        country_codes: ['<string>'],
        full_name: '<string>',
        contact_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        external_contact_id: '<string>',
        secondary_external_contact_id: '<string>'
      }
    ],
    cc: [
      {
        handle: '<string>',
        country_codes: ['<string>'],
        full_name: '<string>',
        contact_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        external_contact_id: '<string>',
        secondary_external_contact_id: '<string>'
      }
    ],
    bcc: [
      {
        handle: '<string>',
        country_codes: ['<string>'],
        full_name: '<string>',
        contact_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        external_contact_id: '<string>',
        secondary_external_contact_id: '<string>'
      }
    ],
    subject: '<string>',
    html: '<string>',
    text: '<string>',
    content: {},
    send_after: '2023-11-07T05:31:56Z',
    placeholder_values: ['<string>'],
    reply_to_message_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    attachments: ['<string>'],
    template_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    review_channel_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    marketing_channel_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    actions: [{text: '<string>', data: '<string>'}],
    footer: '<string>'
  })
};

fetch('https://integration.getmateo.com/api/v1/send_message', 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://integration.getmateo.com/api/v1/send_message",
  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([
    'from' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'conversation_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'to' => [
        [
                'handle' => '<string>',
                'country_codes' => [
                                '<string>'
                ],
                'full_name' => '<string>',
                'contact_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
                'external_contact_id' => '<string>',
                'secondary_external_contact_id' => '<string>'
        ]
    ],
    'cc' => [
        [
                'handle' => '<string>',
                'country_codes' => [
                                '<string>'
                ],
                'full_name' => '<string>',
                'contact_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
                'external_contact_id' => '<string>',
                'secondary_external_contact_id' => '<string>'
        ]
    ],
    'bcc' => [
        [
                'handle' => '<string>',
                'country_codes' => [
                                '<string>'
                ],
                'full_name' => '<string>',
                'contact_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
                'external_contact_id' => '<string>',
                'secondary_external_contact_id' => '<string>'
        ]
    ],
    'subject' => '<string>',
    'html' => '<string>',
    'text' => '<string>',
    'content' => [
        
    ],
    'send_after' => '2023-11-07T05:31:56Z',
    'placeholder_values' => [
        '<string>'
    ],
    'reply_to_message_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'attachments' => [
        '<string>'
    ],
    'template_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'review_channel_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'marketing_channel_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'actions' => [
        [
                'text' => '<string>',
                'data' => '<string>'
        ]
    ],
    'footer' => '<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://integration.getmateo.com/api/v1/send_message"

	payload := strings.NewReader("{\n  \"from\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"conversation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"to\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"cc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"bcc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"subject\": \"<string>\",\n  \"html\": \"<string>\",\n  \"text\": \"<string>\",\n  \"content\": {},\n  \"send_after\": \"2023-11-07T05:31:56Z\",\n  \"placeholder_values\": [\n    \"<string>\"\n  ],\n  \"reply_to_message_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"attachments\": [\n    \"<string>\"\n  ],\n  \"template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"review_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"marketing_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"actions\": [\n    {\n      \"text\": \"<string>\",\n      \"data\": \"<string>\"\n    }\n  ],\n  \"footer\": \"<string>\"\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://integration.getmateo.com/api/v1/send_message")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"from\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"conversation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"to\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"cc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"bcc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"subject\": \"<string>\",\n  \"html\": \"<string>\",\n  \"text\": \"<string>\",\n  \"content\": {},\n  \"send_after\": \"2023-11-07T05:31:56Z\",\n  \"placeholder_values\": [\n    \"<string>\"\n  ],\n  \"reply_to_message_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"attachments\": [\n    \"<string>\"\n  ],\n  \"template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"review_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"marketing_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"actions\": [\n    {\n      \"text\": \"<string>\",\n      \"data\": \"<string>\"\n    }\n  ],\n  \"footer\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://integration.getmateo.com/api/v1/send_message")

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  \"from\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"conversation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"to\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"cc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"bcc\": [\n    {\n      \"handle\": \"<string>\",\n      \"country_codes\": [\n        \"<string>\"\n      ],\n      \"full_name\": \"<string>\",\n      \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n      \"external_contact_id\": \"<string>\",\n      \"secondary_external_contact_id\": \"<string>\"\n    }\n  ],\n  \"subject\": \"<string>\",\n  \"html\": \"<string>\",\n  \"text\": \"<string>\",\n  \"content\": {},\n  \"send_after\": \"2023-11-07T05:31:56Z\",\n  \"placeholder_values\": [\n    \"<string>\"\n  ],\n  \"reply_to_message_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"attachments\": [\n    \"<string>\"\n  ],\n  \"template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"review_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"marketing_channel_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"actions\": [\n    {\n      \"text\": \"<string>\",\n      \"data\": \"<string>\"\n    }\n  ],\n  \"footer\": \"<string>\"\n}"

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

{
  "conversation": {
    "id": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>",
    "organisation_id": "<string>",
    "subject": "<string>",
    "assignee_id": "<string>",
    "unread": true,
    "channel_id": "<string>",
    "contact_id": "<string>",
    "external_id": "<string>",
    "is_spam": true,
    "inbox_id": "<string>",
    "latest_message_id": "<string>",
    "latest_inbound_message_id": "<string>",
    "latest_message_created_at": "<string>",
    "latest_inbound_message_created_at": "<string>",
    "tags": [
      "<string>"
    ],
    "files": [
      {}
    ]
  },
  "message": {
    "id": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>",
    "organisation_id": "<string>",
    "conversation_id": "<string>",
    "is_inbound": true,
    "subject": "<string>",
    "blurb": "<string>",
    "author_id": "<string>",
    "content": {},
    "raw_content": "<string>",
    "attachment_count": 123,
    "reply_to_message_id": "<string>",
    "external_files": {},
    "external_id": "<string>",
    "template_id": "<string>",
    "review_channel_id": "<string>",
    "forwarded": true,
    "forwarded_message_text": "<string>",
    "send_after": "<string>",
    "footer": "<string>",
    "sendout_id": "<string>",
    "campaign_id": "<string>",
    "sent_at": "<string>",
    "timestamp": "<string>",
    "location": {},
    "location_metadata": {},
    "contacts": {},
    "files": {},
    "header_media_filename": "<string>"
  },
  "recipients": [
    {
      "id": "<string>",
      "created_at": "<string>",
      "updated_at": "<string>",
      "organisation_id": "<string>",
      "conversation_id": "<string>",
      "message_id": "<string>",
      "contact_id": "<string>",
      "handle": "<string>",
      "full_name": "<string>",
      "is_organisation": true
    }
  ],
  "actions": [
    {
      "id": "<string>",
      "created_at": "<string>",
      "updated_at": "<string>",
      "organisation_id": "<string>",
      "conversation_id": "<string>",
      "message_id": "<string>",
      "text": "<string>",
      "data": "<string>",
      "clicked": true
    }
  ]
}

{
  "code": "<string>",
  "message": "<string>",
  "statusCode": 123,
  "hint": "<string>"
}