curl --request POST \
  --url https://api.cloudtalk.io/v1/voice-agent/calls \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "call_number": "+421000000000",
  "voice_agent_id": "681b0639876543cfbc3d6b55",
  "contact_id": "123456",
  "call_properties": {
    "output": {
      "variables": {
        "external_contact_id": 12345
      }
    },
    "system_prompt": {
      "variables": {
        "name": "John Doe",
        "company": "CloudTalk"
      }
    }
  }
}
'

import requests

url = "https://api.cloudtalk.io/v1/voice-agent/calls"

payload = {
    "call_number": "+421000000000",
    "voice_agent_id": "681b0639876543cfbc3d6b55",
    "contact_id": "123456",
    "call_properties": {
        "output": { "variables": { "external_contact_id": 12345 } },
        "system_prompt": { "variables": {
                "name": "John Doe",
                "company": "CloudTalk"
            } }
    }
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    call_number: '+421000000000',
    voice_agent_id: '681b0639876543cfbc3d6b55',
    contact_id: '123456',
    call_properties: {
      output: {variables: {external_contact_id: 12345}},
      system_prompt: {variables: {name: 'John Doe', company: 'CloudTalk'}}
    }
  })
};

fetch('https://api.cloudtalk.io/v1/voice-agent/calls', 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.cloudtalk.io/v1/voice-agent/calls",
  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([
    'call_number' => '+421000000000',
    'voice_agent_id' => '681b0639876543cfbc3d6b55',
    'contact_id' => '123456',
    'call_properties' => [
        'output' => [
                'variables' => [
                                'external_contact_id' => 12345
                ]
        ],
        'system_prompt' => [
                'variables' => [
                                'name' => 'John Doe',
                                'company' => 'CloudTalk'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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://api.cloudtalk.io/v1/voice-agent/calls"

	payload := strings.NewReader("{\n  \"call_number\": \"+421000000000\",\n  \"voice_agent_id\": \"681b0639876543cfbc3d6b55\",\n  \"contact_id\": \"123456\",\n  \"call_properties\": {\n    \"output\": {\n      \"variables\": {\n        \"external_contact_id\": 12345\n      }\n    },\n    \"system_prompt\": {\n      \"variables\": {\n        \"name\": \"John Doe\",\n        \"company\": \"CloudTalk\"\n      }\n    }\n  }\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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.cloudtalk.io/v1/voice-agent/calls")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"call_number\": \"+421000000000\",\n  \"voice_agent_id\": \"681b0639876543cfbc3d6b55\",\n  \"contact_id\": \"123456\",\n  \"call_properties\": {\n    \"output\": {\n      \"variables\": {\n        \"external_contact_id\": 12345\n      }\n    },\n    \"system_prompt\": {\n      \"variables\": {\n        \"name\": \"John Doe\",\n        \"company\": \"CloudTalk\"\n      }\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.cloudtalk.io/v1/voice-agent/calls")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"call_number\": \"+421000000000\",\n  \"voice_agent_id\": \"681b0639876543cfbc3d6b55\",\n  \"contact_id\": \"123456\",\n  \"call_properties\": {\n    \"output\": {\n      \"variables\": {\n        \"external_contact_id\": 12345\n      }\n    },\n    \"system_prompt\": {\n      \"variables\": {\n        \"name\": \"John Doe\",\n        \"company\": \"CloudTalk\"\n      }\n    }\n  }\n}"

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