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#include <HTTPClient.h>

const char* ssid = "your_WiFi_SSID";
const char* password = "your_WiFi_password";

const char* accountSid = "your_Twilio_account_SID";
const char* authToken = "your_Twilio_auth_token";
const char* fromNumber = "+1your_Twilio_number";
const char* toNumber = "+1receiver_number";
const char* callUrl = "http://twimlets.com/holdmusic?Bucket=com.twilio.music.ambient";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  makeCall();
}

void loop() {
  // empty
}

void makeCall() {
  HTTPClient http;
  String url = "https://api.twilio.com/2010-04-01/Accounts/";
  url += accountSid;
  url += "/Calls.json";

  http.begin(url);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  http.addHeader("Authorization", "Basic " + base64::encode(accountSid + ":" + authToken));

  String payload = "To=" + toNumber;
  payload += "&From=" + fromNumber;
  payload += "&Url=" + callUrl;

  int httpCode = http.POST(payload);
  String response = http.getString();

  Serial.println("Response code: " + String(httpCode));
  Serial.println("Response body: " + response);
}