curl --request POST \
  --url https://app.callrounded.com/api/v0/calls/phone \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "from_number": "+33912345678",
  "to_number": "+33612345678",
  "agent_id": "411b82c8-462a-4e1b-89bc-10ab3ce1ed29",
  "dynamic_variables_values": {
    "first_name": "John",
    "last_name": "Doe"
  }
}
'

import requests

url = "https://app.callrounded.com/api/v0/calls/phone"

payload = {
    "from_number": "+33912345678",
    "to_number": "+33612345678",
    "agent_id": "411b82c8-462a-4e1b-89bc-10ab3ce1ed29",
    "dynamic_variables_values": {
        "first_name": "John",
        "last_name": "Doe"
    }
}
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_number: '+33912345678',
    to_number: '+33612345678',
    agent_id: '411b82c8-462a-4e1b-89bc-10ab3ce1ed29',
    dynamic_variables_values: {first_name: 'John', last_name: 'Doe'}
  })
};

fetch('https://app.callrounded.com/api/v0/calls/phone', 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://app.callrounded.com/api/v0/calls/phone",
  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_number' => '+33912345678',
    'to_number' => '+33612345678',
    'agent_id' => '411b82c8-462a-4e1b-89bc-10ab3ce1ed29',
    'dynamic_variables_values' => [
        'first_name' => 'John',
        'last_name' => 'Doe'
    ]
  ]),
  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://app.callrounded.com/api/v0/calls/phone"

	payload := strings.NewReader("{\n  \"from_number\": \"+33912345678\",\n  \"to_number\": \"+33612345678\",\n  \"agent_id\": \"411b82c8-462a-4e1b-89bc-10ab3ce1ed29\",\n  \"dynamic_variables_values\": {\n    \"first_name\": \"John\",\n    \"last_name\": \"Doe\"\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://app.callrounded.com/api/v0/calls/phone")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"from_number\": \"+33912345678\",\n  \"to_number\": \"+33612345678\",\n  \"agent_id\": \"411b82c8-462a-4e1b-89bc-10ab3ce1ed29\",\n  \"dynamic_variables_values\": {\n    \"first_name\": \"John\",\n    \"last_name\": \"Doe\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.callrounded.com/api/v0/calls/phone")

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_number\": \"+33912345678\",\n  \"to_number\": \"+33612345678\",\n  \"agent_id\": \"411b82c8-462a-4e1b-89bc-10ab3ce1ed29\",\n  \"dynamic_variables_values\": {\n    \"first_name\": \"John\",\n    \"last_name\": \"Doe\"\n  }\n}"

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

{
  "call_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}

{
  "error": "<string>"
}