Java SMS-API: ein HTTPS-Aufruf für mehrere Kanäle

import java.net.HttpURLConnection;
import java.net.URI;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;

public class SendSms {
    public static void main(String[] args) throws Exception {
        var url = URI.create("https://api.esendex.fr/v2/messages").toURL();
        var conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setRequestProperty("X-Api-Key", "YOUR_KEY_HERE");
        conn.setRequestProperty("Content-Type", "application/json");
        conn.setDoOutput(true);

        String body = """
            {
              "accountReference": "xxxxxxxxxx",
              "channel": "SMS",
              "from": "MonEntreprise",
              "body": { "text": "Bonjour, votre commande #1234 a été expédiée." },
              "recipients": [{ "msisdn": "+33612345678" }]
            }
            """;

        try (var os = conn.getOutputStream()) {
            os.write(body.getBytes(StandardCharsets.UTF_8));
        }

        System.out.println("HTTP " + conn.getResponseCode());
        conn.disconnect();
    }
}