curl --request POST \
  --url https://www.closient.com/notifications/api/v1/sms/webhooks/inbound/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "",
  "from": "",
  "body": "",
  "data": {
    "event_type": "message.received",
    "payload": {
      "from": {
        "phone_number": "+15035550199"
      },
      "id": "84cca175-9755-4859-b67f-4730d7f58aa3",
      "text": "STOP",
      "to": [
        {
          "phone_number": "+18445551234"
        }
      ]
    }
  }
}
'

import requests

url = "https://www.closient.com/notifications/api/v1/sms/webhooks/inbound/"

payload = {
    "to": "",
    "from": "",
    "body": "",
    "data": {
        "event_type": "message.received",
        "payload": {
            "from": { "phone_number": "+15035550199" },
            "id": "84cca175-9755-4859-b67f-4730d7f58aa3",
            "text": "STOP",
            "to": [{ "phone_number": "+18445551234" }]
        }
    }
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    to: '',
    from: '',
    body: JSON.stringify(''),
    data: {
      event_type: 'message.received',
      payload: {
        from: {phone_number: '+15035550199'},
        id: '84cca175-9755-4859-b67f-4730d7f58aa3',
        text: 'STOP',
        to: [{phone_number: '+18445551234'}]
      }
    }
  })
};

fetch('https://www.closient.com/notifications/api/v1/sms/webhooks/inbound/', 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://www.closient.com/notifications/api/v1/sms/webhooks/inbound/",
  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([
    'to' => '',
    'from' => '',
    'body' => '',
    'data' => [
        'event_type' => 'message.received',
        'payload' => [
                'from' => [
                                'phone_number' => '+15035550199'
                ],
                'id' => '84cca175-9755-4859-b67f-4730d7f58aa3',
                'text' => 'STOP',
                'to' => [
                                [
                                                                'phone_number' => '+18445551234'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "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://www.closient.com/notifications/api/v1/sms/webhooks/inbound/"

	payload := strings.NewReader("{\n  \"to\": \"\",\n  \"from\": \"\",\n  \"body\": \"\",\n  \"data\": {\n    \"event_type\": \"message.received\",\n    \"payload\": {\n      \"from\": {\n        \"phone_number\": \"+15035550199\"\n      },\n      \"id\": \"84cca175-9755-4859-b67f-4730d7f58aa3\",\n      \"text\": \"STOP\",\n      \"to\": [\n        {\n          \"phone_number\": \"+18445551234\"\n        }\n      ]\n    }\n  }\n}")

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

	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://www.closient.com/notifications/api/v1/sms/webhooks/inbound/")
  .header("Content-Type", "application/json")
  .body("{\n  \"to\": \"\",\n  \"from\": \"\",\n  \"body\": \"\",\n  \"data\": {\n    \"event_type\": \"message.received\",\n    \"payload\": {\n      \"from\": {\n        \"phone_number\": \"+15035550199\"\n      },\n      \"id\": \"84cca175-9755-4859-b67f-4730d7f58aa3\",\n      \"text\": \"STOP\",\n      \"to\": [\n        {\n          \"phone_number\": \"+18445551234\"\n        }\n      ]\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://www.closient.com/notifications/api/v1/sms/webhooks/inbound/")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"to\": \"\",\n  \"from\": \"\",\n  \"body\": \"\",\n  \"data\": {\n    \"event_type\": \"message.received\",\n    \"payload\": {\n      \"from\": {\n        \"phone_number\": \"+15035550199\"\n      },\n      \"id\": \"84cca175-9755-4859-b67f-4730d7f58aa3\",\n      \"text\": \"STOP\",\n      \"to\": [\n        {\n          \"phone_number\": \"+18445551234\"\n        }\n      ]\n    }\n  }\n}"

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

{
  "ok": true,
  "action": ""
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "error_code": "<string>",
  "timestamp": "<string>",
  "retryable": false,
  "retry_after": 123,
  "owner_action_required": true,
  "details": "<unknown>"
}