curl --request POST \
  --url https://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability \
  --header 'Content-Type: application/json' \
  --data '
{
  "conversation_id": "conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01",
  "agent_id": "agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01",
  "caller_id": "+14165550100",
  "called_id": "+12362320246",
  "called_number": "+12362320246"
}
'

import requests

url = "https://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability"

payload = {
    "conversation_id": "conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01",
    "agent_id": "agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01",
    "caller_id": "+14165550100",
    "called_id": "+12362320246",
    "called_number": "+12362320246"
}
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({
    conversation_id: 'conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01',
    agent_id: 'agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01',
    caller_id: '+14165550100',
    called_id: '+12362320246',
    called_number: '+12362320246'
  })
};

fetch('https://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability', 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://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability",
  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' => 'conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01',
    'agent_id' => 'agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01',
    'caller_id' => '+14165550100',
    'called_id' => '+12362320246',
    'called_number' => '+12362320246'
  ]),
  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://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability"

	payload := strings.NewReader("{\n  \"conversation_id\": \"conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01\",\n  \"agent_id\": \"agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01\",\n  \"caller_id\": \"+14165550100\",\n  \"called_id\": \"+12362320246\",\n  \"called_number\": \"+12362320246\"\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://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability")
  .header("Content-Type", "application/json")
  .body("{\n  \"conversation_id\": \"conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01\",\n  \"agent_id\": \"agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01\",\n  \"caller_id\": \"+14165550100\",\n  \"called_id\": \"+12362320246\",\n  \"called_number\": \"+12362320246\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://your-instance.example.com/api/webhook/elevenlabs/tools/check-availability")

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  \"conversation_id\": \"conv_8f3d1b9c2e7a4f0b9a4d2c1e6e2f8c01\",\n  \"agent_id\": \"agent_a8d3c4e09b2f4e1ab3c45f6a7b8c9d01\",\n  \"caller_id\": \"+14165550100\",\n  \"called_id\": \"+12362320246\",\n  \"called_number\": \"+12362320246\"\n}"

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

{
  "agents_available": true,
  "available_count": 2,
  "online_count": 4
}

{
  "error": "Webhook processing failed"
}

{
  "error": "Webhook processing failed"
}