Convert to WAV Callbacks

System will call this callback when WAV format audio generation is complete.

When you submit a WAV format conversion task to the Suno API, you can use the callBackUrl parameter to set a callback URL. The system will automatically push the results to your specified address when the task is completed.

Callback Mechanism Overview

INFO

The callback mechanism eliminates the need to poll the API for task status. The system will proactively push task completion results to your server.

Webhook Security

To ensure the authenticity and integrity of callback requests, we strongly recommend implementing webhook signature verification. See our Webhook Verification Guide for detailed implementation steps.

Callback Timing

The system will send callback notifications in the following situations:

• WAV format conversion task completed successfully
• WAV format conversion task failed
• Errors occurred during task processing

Callback Method

• HTTP Method: POST
• Content Type: application/json
• Timeout Setting: 15 seconds

Callback Request Format

When the task is completed, the system will send a POST request to your callBackUrl in the following format:

Success Callback

{
  "code": 200,
  "msg": "success",
  "data": {
    "audioWavUrl": "https://example.com/s/04e6****e727.wav",
    "task_id": "988e****c8d3"
  }
}

Failure Callback

{
  "code": 500,
  "msg": "Internal Error - Please try again later",
  "data": {
    "audioWavUrl": null,
    "task_id": "988e****c8d3"
  }
}

Status Code Description

code (integer, required)

Callback status code indicating task processing result:

Status Code	Description
200	Success - Request has been processed successfully
500	Internal Error - Please try again later

msg (string, required)

Status message providing detailed status description

data.task_id (string, required)

Task ID, consistent with the task_id returned when you submitted the task

data.audioWavUrl (string)

WAV format audio file URL, returned on success with accessible download link

Callback Reception Examples

Here are example codes for receiving callbacks in popular programming languages:

Node.js

const express = require('express');
const app = express();

app.use(express.json());

app.post('/suno-wav-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received WAV conversion callback:', {
    taskId: data.task_id,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Task completed successfully
    console.log('WAV conversion completed');
    console.log(`WAV file URL: ${data.audioWavUrl}`);
    
    // Process generated WAV file
    // Can download file, save locally, etc.
    
  } else {
    // Task failed
    console.log('WAV conversion failed:', msg);
    
    // Handle failure cases...
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

app.listen(3000, () => {
  console.log('Callback server running on port 3000');
});

Python

from flask import Flask, request, jsonify
import requests

app = Flask(__name__)

@app.route('/suno-wav-callback', methods=['POST'])
def handle_callback():
    data = request.json
    
    code = data.get('code')
    msg = data.get('msg')
    callback_data = data.get('data', {})
    task_id = callback_data.get('task_id')
    audio_wav_url = callback_data.get('audioWavUrl')
    
    print(f"Received WAV conversion callback: {task_id}, status: {code}, message: {msg}")
    
    if code == 200:
        # Task completed successfully
        print("WAV conversion completed")
        print(f"WAV file URL: {audio_wav_url}")
        
        # Process generated WAV file
        # Can download file, save locally, etc.
        if audio_wav_url:
            try:
                # Download WAV file example
                response = requests.get(audio_wav_url)
                if response.status_code == 200:
                    with open(f"wav_file_{task_id}.wav", "wb") as f:
                        f.write(response.content)
                    print(f"WAV file saved as wav_file_{task_id}.wav")
            except Exception as e:
                print(f"WAV file download failed: {e}")
                
    else:
        # Task failed
        print(f"WAV conversion failed: {msg}")
        
        # Handle failure cases...
    
    # Return 200 status code to confirm callback received
    return jsonify({'status': 'received'}), 200

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=3000)

PHP

<?php
header('Content-Type: application/json');

// Get POST data
$input = file_get_contents('php://input');
$data = json_decode($input, true);

$code = $data['code'] ?? null;
$msg = $data['msg'] ?? '';
$callbackData = $data['data'] ?? [];
$taskId = $callbackData['task_id'] ?? '';
$audioWavUrl = $callbackData['audioWavUrl'] ?? '';

error_log("Received WAV conversion callback: $taskId, status: $code, message: $msg");

if ($code === 200) {
    // Task completed successfully
    error_log("WAV conversion completed");
    error_log("WAV file URL: $audioWavUrl");
    
    // Process generated WAV file
    if (!empty($audioWavUrl)) {
        try {
            // Download WAV file example
            $wavContent = file_get_contents($audioWavUrl);
            if ($wavContent !== false) {
                $filename = "wav_file_{$taskId}.wav";
                file_put_contents($filename, $wavContent);
                error_log("WAV file saved as $filename");
            }
        } catch (Exception $e) {
            error_log("WAV file download failed: " . $e->getMessage());
        }
    }
    
} else {
    // Task failed
    error_log("WAV conversion failed: $msg");
    
    // Handle failure cases...
}

// Return 200 status code to confirm callback received
http_response_code(200);
echo json_encode(['status' => 'received']);
?>

Best Practices

Callback URL Configuration Recommendations

1. Use HTTPS: Ensure your callback URL uses HTTPS protocol for secure data transmission
2. Verify Source: Verify the legitimacy of the request source in callback processing
3. Idempotent Processing: The same task_id may receive multiple callbacks, ensure processing logic is idempotent
4. Quick Response: Callback processing should return a 200 status code as quickly as possible to avoid timeout
5. Asynchronous Processing: Complex business logic should be processed asynchronously to avoid blocking callback response
6. File Processing: WAV file download and processing should be done in asynchronous tasks to avoid blocking callback response

Important Reminders

• Callback URL must be a publicly accessible address
• Server must respond within 15 seconds, otherwise it will be considered a timeout
• If 3 consecutive retries fail, the system will stop sending callbacks
• Please ensure the stability of callback processing logic to avoid callback failures due to exceptions
• WAV file URLs may have time limits, recommend downloading and saving promptly

Troubleshooting

If you do not receive callback notifications, please check the following:

Network Connection Issues

• Confirm that the callback URL is accessible from the public network
• Check firewall settings to ensure inbound requests are not blocked
• Verify that domain name resolution is correct

Server Response Issues

• Ensure the server returns HTTP 200 status code within 15 seconds
• Check server logs for error messages
• Verify that the interface path and HTTP method are correct

Content Format Issues

• Confirm that the received POST request body is in JSON format
• Check that Content-Type is application/json
• Verify that JSON parsing is correct

File Processing Issues

• Confirm that the WAV file URL is accessible
• Check file download permissions and network connections
• Verify file save paths and permissions

Alternative Solution

If you cannot use the callback mechanism, you can also use polling:

Poll Query Results

Use the get WAV details endpoint to regularly query task status. We recommend querying every 30 seconds.