> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apikley.ru/llms.txt
> Use this file to discover all available pages before exploring further.

# Suno api upload and cover audio callbacks

# Audio Upload and Cover Callbacks

> System will call this callback when audio generation is complete

When you submit an audio upload and cover 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.
</Info>

### Callback Timing

The system will send callback notifications in the following situations:

* Text generation completed (callbackType: "text")
* First audio track generation completed (callbackType: "first")
* All audio tracks generation completed (callbackType: "complete")
* Audio generation 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 progresses or completes, the system will send a POST request to your `callBackUrl` in the following format:

<CodeGroup>
  ```json Complete Success Callback theme={null} theme={null}
  {
    "code": 200,
    "msg": "All generated successfully.",
    "data": {
      "callbackType": "complete",
      "task_id": "2fac****9f72",
      "data": [
        {
          "id": "e231****-****-****-****-****8cadc7dc",
          "audio_url": "https://example.cn/****.mp3",
          "source_audio_url": "https://example.cn/****.mp3",
          "stream_audio_url": "https://example.cn/****",
          "source_stream_audio_url": "https://example.cn/****",
          "image_url": "https://example.cn/****.jpeg",
          "source_image_url": "https://example.cn/****.jpeg",
          "prompt": "[Verse] Night city lights shining bright",
          "model_name": "chirp-v3-5",
          "title": "Iron Man",
          "tags": "electrifying, rock",
          "createTime": "2025-01-01 00:00:00",
          "duration": 198.44
        },
        {
          "id": "e231****-****-****-****-****8cadc7dc",
          "audio_url": "https://example.cn/****.mp3",
          "source_audio_url": "https://example.cn/****.mp3",
          "stream_audio_url": "https://example.cn/****",
          "source_stream_audio_url": "https://example.cn/****",
          "image_url": "https://example.cn/****.jpeg",
          "source_image_url": "https://example.cn/****.jpeg",
          "prompt": "[Verse] Night city lights shining bright",
          "model_name": "chirp-v3-5",
          "title": "Iron Man",
          "tags": "electrifying, rock",
          "createTime": "2025-01-01 00:00:00",
          "duration": 228.28
        }
      ]
    }
  }
  ```

  ```json First Track Complete Callback theme={null} theme={null}
  {
    "code": 200,
    "msg": "First track generated successfully.",
    "data": {
      "callbackType": "first",
      "task_id": "2fac****9f72",
      "data": [
        {
          "id": "e231****-****-****-****-****8cadc7dc",
          "audio_url": "https://example.cn/****.mp3",
          "source_audio_url": "https://example.cn/****.mp3",
          "stream_audio_url": "https://example.cn/****",
          "source_stream_audio_url": "https://example.cn/****",
          "image_url": "https://example.cn/****.jpeg",
          "source_image_url": "https://example.cn/****.jpeg",
          "prompt": "[Verse] Night city lights shining bright",
          "model_name": "chirp-v3-5",
          "title": "Iron Man",
          "tags": "electrifying, rock",
          "createTime": "2025-01-01 00:00:00",
          "duration": 198.44
        }
      ]
    }
  }
  ```

  ```json Text Generation Complete Callback theme={null} theme={null}
  {
    "code": 200,
    "msg": "Text generation completed.",
    "data": {
      "callbackType": "text",
      "task_id": "2fac****9f72",
      "data": []
    }
  }
  ```

  ```json Failure Callback theme={null} theme={null}
  {
    "code": 501,
    "msg": "Audio generation failed.",
    "data": {
      "callbackType": "error",
      "task_id": "2fac****9f72",
      "data": []
    }
  }
  ```
</CodeGroup>

## Status Code Description

<ParamField path="code" type="integer" required>
  Callback status code indicating task processing result:

  | Status Code | Description                                                                                                    |
  | ----------- | -------------------------------------------------------------------------------------------------------------- |
  | 200         | Success - Request has been processed successfully                                                              |
  | 400         | Validation Error - Lyrics contained copyrighted material                                                       |
  | 408         | Rate Limited - Timeout                                                                                         |
  | 413         | Conflict - Uploaded audio matches existing work of art                                                         |
  | 500         | Server Error - An unexpected error occurred while processing the request                                       |
  | 501         | Audio generation failed                                                                                        |
  | 531         | Server Error - Sorry, the generation failed due to an issue. Your credits have been refunded. Please try again |
</ParamField>

<ParamField path="msg" type="string" required>
  Status message providing detailed status description
</ParamField>

<ParamField path="data.callbackType" type="string" required>
  Callback type indicating the stage of generation:

  * **text**: Text generation complete
  * **first**: First track complete
  * **complete**: All tracks complete
  * **error**: Generation failed
</ParamField>

<ParamField path="data.task_id" type="string" required>
  Task ID, consistent with the taskId returned when you submitted the task
</ParamField>

<ParamField path="data.data" type="array" required>
  Array of generated audio tracks. Empty for text callbacks or failures.
</ParamField>

<ParamField path="data.data[].id" type="string">
  Audio unique identifier (audioId)
</ParamField>

<ParamField path="data.data[].audio_url" type="string">
  Generated audio file URL for download
</ParamField>

<ParamField path="data.data[].source_audio_url" type="string">
  Original source audio file URL
</ParamField>

<ParamField path="data.data[].stream_audio_url" type="string">
  Generated streaming audio URL for real-time playback
</ParamField>

<ParamField path="data.data[].source_stream_audio_url" type="string">
  Original source streaming audio URL
</ParamField>

<ParamField path="data.data[].image_url" type="string">
  Generated cover image URL
</ParamField>

<ParamField path="data.data[].source_image_url" type="string">
  Original source cover image URL
</ParamField>

<ParamField path="data.data[].prompt" type="string">
  Generation prompt/lyrics used
</ParamField>

<ParamField path="data.data[].model_name" type="string">
  Model name used for generation (e.g., "chirp-v3-5")
</ParamField>

<ParamField path="data.data[].title" type="string">
  Music title
</ParamField>

<ParamField path="data.data[].tags" type="string">
  Music tags/genre
</ParamField>

<ParamField path="data.data[].createTime" type="string">
  Creation timestamp
</ParamField>

<ParamField path="data.data[].duration" type="number">
  Audio duration in seconds
</ParamField>

## Callback Reception Examples

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

<Tabs>
  <Tab title="Node.js">
    ```javascript theme={null} theme={null}
    const express = require('express');
    const fs = require('fs');
    const https = require('https');
    const app = express();

    app.use(express.json());

    app.post('/suno-cover-callback', (req, res) => {
      const { code, msg, data } = req.body;
      
      console.log('Received Suno audio cover callback:', {
        taskId: data.task_id,
        callbackType: data.callbackType,
        status: code,
        message: msg
      });
      
      if (code === 200) {
        // Task progressed or completed successfully
        const { callbackType, task_id, data: tracks } = data;
        
        console.log(`Callback type: ${callbackType}`);
        console.log(`Number of tracks: ${tracks.length}`);
        
        switch (callbackType) {
          case 'text':
            console.log('Text generation completed, waiting for audio...');
            break;
            
          case 'first':
            console.log('First track completed, processing remaining tracks...');
            downloadTracks(tracks, task_id);
            break;
            
          case 'complete':
            console.log('All tracks completed successfully!');
            downloadTracks(tracks, task_id);
            break;
        }
        
      } else {
        // Task failed
        console.log('Suno audio cover failed:', msg);
        
        // Handle specific error types
        if (code === 400) {
          console.log('Validation error - check for copyrighted content');
        } else if (code === 408) {
          console.log('Rate limited - please wait before retrying');
        } else if (code === 413) {
          console.log('Content conflict - uploaded audio matches existing work');
        } else if (code === 501) {
          console.log('Generation failed - may need to adjust parameters');
        } else if (code === 531) {
          console.log('Server error with credit refund - safe to retry');
        }
      }
      
      // Return 200 status code to confirm callback received
      res.status(200).json({ status: 'received' });
    });

    // Function to download tracks
    function downloadTracks(tracks, taskId) {
      tracks.forEach((track, index) => {
        const { 
          id, 
          audio_url, 
          source_audio_url,
          image_url, 
          source_image_url,
          title, 
          duration 
        } = track;
        
        console.log(`Track ${index + 1}: ${title} (${duration}s)`);
        
        // Download generated audio file
        if (audio_url) {
          downloadFile(audio_url, `suno_cover_${taskId}_${id}.mp3`)
            .then(() => console.log(`Generated audio downloaded: ${id}`))
            .catch(err => console.error(`Generated audio download failed for ${id}:`, err));
        }
        
        // Download source audio file
        if (source_audio_url) {
          downloadFile(source_audio_url, `suno_source_${taskId}_${id}.mp3`)
            .then(() => console.log(`Source audio downloaded: ${id}`))
            .catch(err => console.error(`Source audio download failed for ${id}:`, err));
        }
        
        // Download generated cover image
        if (image_url) {
          downloadFile(image_url, `suno_cover_img_${taskId}_${id}.jpeg`)
            .then(() => console.log(`Generated cover downloaded: ${id}`))
            .catch(err => console.error(`Generated cover download failed for ${id}:`, err));
        }
        
        // Download source cover image
        if (source_image_url) {
          downloadFile(source_image_url, `suno_source_img_${taskId}_${id}.jpeg`)
            .then(() => console.log(`Source cover downloaded: ${id}`))
            .catch(err => console.error(`Source cover download failed for ${id}:`, err));
        }
      });
    }

    // Helper function to download files
    function downloadFile(url, filename) {
      return new Promise((resolve, reject) => {
        const file = fs.createWriteStream(filename);
        
        https.get(url, (response) => {
          if (response.statusCode === 200) {
            response.pipe(file);
            file.on('finish', () => {
              file.close();
              resolve();
            });
          } else {
            reject(new Error(`HTTP ${response.statusCode}`));
          }
        }).on('error', reject);
      });
    }

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

  <Tab title="Python">
    ```python theme={null} theme={null}
    from flask import Flask, request, jsonify
    import requests
    import os

    app = Flask(__name__)

    @app.route('/suno-cover-callback', methods=['POST'])
    def handle_callback():
        data = request.json
        
        code = data.get('code')
        msg = data.get('msg')
        callback_data = data.get('data', {})
        callback_type = callback_data.get('callbackType')
        task_id = callback_data.get('task_id')
        tracks = callback_data.get('data', [])
        
        print(f"Received Suno audio cover callback:")
        print(f"Task ID: {task_id}, Type: {callback_type}")
        print(f"Status: {code}, Message: {msg}")
        
        if code == 200:
            # Task progressed or completed successfully
            print(f"Callback type: {callback_type}")
            print(f"Number of tracks: {len(tracks)}")
            
            if callback_type == 'text':
                print("Text generation completed, waiting for audio...")
            elif callback_type == 'first':
                print("First track completed, processing remaining tracks...")
                download_tracks(tracks, task_id)
            elif callback_type == 'complete':
                print("All tracks completed successfully!")
                download_tracks(tracks, task_id)
                
        else:
            # Task failed
            print(f"Suno audio cover failed: {msg}")
            
            # Handle specific error types
            if code == 400:
                print("Validation error - check for copyrighted content")
            elif code == 408:
                print("Rate limited - please wait before retrying")
            elif code == 413:
                print("Content conflict - uploaded audio matches existing work")
            elif code == 501:
                print("Generation failed - may need to adjust parameters")
            elif code == 531:
                print("Server error with credit refund - safe to retry")
        
        # Return 200 status code to confirm callback received
        return jsonify({'status': 'received'}), 200

    def download_tracks(tracks, task_id):
        """Download audio tracks and cover images"""
        for i, track in enumerate(tracks):
            track_id = track.get('id')
            audio_url = track.get('audio_url')
            source_audio_url = track.get('source_audio_url')
            image_url = track.get('image_url')
            source_image_url = track.get('source_image_url')
            title = track.get('title')
            duration = track.get('duration')
            
            print(f"Track {i + 1}: {title} ({duration}s)")
            
            # Download generated audio file
            if audio_url:
                try:
                    audio_filename = f"suno_cover_{task_id}_{track_id}.mp3"
                    download_file(audio_url, audio_filename)
                    print(f"Generated audio downloaded: {track_id}")
                except Exception as e:
                    print(f"Generated audio download failed for {track_id}: {e}")
            
            # Download source audio file
            if source_audio_url:
                try:
                    source_audio_filename = f"suno_source_{task_id}_{track_id}.mp3"
                    download_file(source_audio_url, source_audio_filename)
                    print(f"Source audio downloaded: {track_id}")
                except Exception as e:
                    print(f"Source audio download failed for {track_id}: {e}")
            
            # Download generated cover image
            if image_url:
                try:
                    image_filename = f"suno_cover_img_{task_id}_{track_id}.jpeg"
                    download_file(image_url, image_filename)
                    print(f"Generated cover downloaded: {track_id}")
                except Exception as e:
                    print(f"Generated cover download failed for {track_id}: {e}")
            
            # Download source cover image
            if source_image_url:
                try:
                    source_image_filename = f"suno_source_img_{task_id}_{track_id}.jpeg"
                    download_file(source_image_url, source_image_filename)
                    print(f"Source cover downloaded: {track_id}")
                except Exception as e:
                    print(f"Source cover download failed for {track_id}: {e}")

    def download_file(url, filename):
        """Download file from URL and save locally"""
        response = requests.get(url, stream=True)
        response.raise_for_status()
        
        os.makedirs('downloads', exist_ok=True)
        filepath = os.path.join('downloads', filename)
        
        with open(filepath, 'wb') as f:
            for chunk in response.iter_content(chunk_size=8192):
                f.write(chunk)

    if __name__ == '__main__':
        app.run(host='0.0.0.0', port=3000)
    ```
  </Tab>

  <Tab title="PHP">
    ```php theme={null} theme={null}
    <?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'] ?? [];
    $callbackType = $callbackData['callbackType'] ?? '';
    $taskId = $callbackData['task_id'] ?? '';
    $tracks = $callbackData['data'] ?? [];

    error_log("Received Suno audio cover callback:");
    error_log("Task ID: $taskId, Type: $callbackType");
    error_log("Status: $code, Message: $msg");

    if ($code === 200) {
        // Task progressed or completed successfully
        error_log("Callback type: $callbackType");
        error_log("Number of tracks: " . count($tracks));
        
        switch ($callbackType) {
            case 'text':
                error_log("Text generation completed, waiting for audio...");
                break;
                
            case 'first':
                error_log("First track completed, processing remaining tracks...");
                downloadTracks($tracks, $taskId);
                break;
                
            case 'complete':
                error_log("All tracks completed successfully!");
                downloadTracks($tracks, $taskId);
                break;
        }
        
    } else {
        // Task failed
        error_log("Suno audio cover failed: $msg");
        
        // Handle specific error types
        if ($code === 400) {
            error_log("Validation error - check for copyrighted content");
        } elseif ($code === 408) {
            error_log("Rate limited - please wait before retrying");
        } elseif ($code === 413) {
            error_log("Content conflict - uploaded audio matches existing work");
        } elseif ($code === 501) {
            error_log("Generation failed - may need to adjust parameters");
        } elseif ($code === 531) {
            error_log("Server error with credit refund - safe to retry");
        }
    }

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

    function downloadTracks($tracks, $taskId) {
        foreach ($tracks as $i => $track) {
            $trackId = $track['id'] ?? '';
            $audioUrl = $track['audio_url'] ?? '';
            $sourceAudioUrl = $track['source_audio_url'] ?? '';
            $imageUrl = $track['image_url'] ?? '';
            $sourceImageUrl = $track['source_image_url'] ?? '';
            $title = $track['title'] ?? '';
            $duration = $track['duration'] ?? 0;
            
            error_log("Track " . ($i + 1) . ": $title ({$duration}s)");
            
            // Download generated audio file
            if (!empty($audioUrl)) {
                try {
                    $audioFilename = "suno_cover_{$taskId}_{$trackId}.mp3";
                    downloadFile($audioUrl, $audioFilename);
                    error_log("Generated audio downloaded: $trackId");
                } catch (Exception $e) {
                    error_log("Generated audio download failed for $trackId: " . $e->getMessage());
                }
            }
            
            // Download source audio file
            if (!empty($sourceAudioUrl)) {
                try {
                    $sourceAudioFilename = "suno_source_{$taskId}_{$trackId}.mp3";
                    downloadFile($sourceAudioUrl, $sourceAudioFilename);
                    error_log("Source audio downloaded: $trackId");
                } catch (Exception $e) {
                    error_log("Source audio download failed for $trackId: " . $e->getMessage());
                }
            }
            
            // Download generated cover image
            if (!empty($imageUrl)) {
                try {
                    $imageFilename = "suno_cover_img_{$taskId}_{$trackId}.jpeg";
                    downloadFile($imageUrl, $imageFilename);
                    error_log("Generated cover downloaded: $trackId");
                } catch (Exception $e) {
                    error_log("Generated cover download failed for $trackId: " . $e->getMessage());
                }
            }
            
            // Download source cover image
            if (!empty($sourceImageUrl)) {
                try {
                    $sourceImageFilename = "suno_source_img_{$taskId}_{$trackId}.jpeg";
                    downloadFile($sourceImageUrl, $sourceImageFilename);
                    error_log("Source cover downloaded: $trackId");
                } catch (Exception $e) {
                    error_log("Source cover download failed for $trackId: " . $e->getMessage());
                }
            }
        }
    }

    function downloadFile($url, $filename) {
        $downloadDir = 'downloads';
        if (!is_dir($downloadDir)) {
            mkdir($downloadDir, 0755, true);
        }
        
        $filepath = $downloadDir . '/' . $filename;
        
        $fileContent = file_get_contents($url);
        if ($fileContent === false) {
            throw new Exception("Failed to download file from URL");
        }
        
        $result = file_put_contents($filepath, $fileContent);
        if ($result === false) {
            throw new Exception("Failed to save file locally");
        }
    }
    ?>
    ```
  </Tab>
</Tabs>

## Best Practices

<Tip>
  ### 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. **Handle Multiple Callbacks**: Be prepared to receive text, first, and complete callbacks for the same task
  7. **Download Both Versions**: Consider downloading both generated and source files for comparison
</Tip>

<Warning>
  ### 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
  * You may receive multiple callbacks for the same task (text → first → complete)
  * Please ensure the stability of callback processing logic to avoid callback failures due to exceptions
  * Handle copyright and conflict errors appropriately (codes 400, 413)
  * Credit refunds are automatic for certain server errors (code 531)
  * Be aware of both generated and source file URLs for complete asset management
</Warning>

## Troubleshooting

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

<AccordionGroup>
  <Accordion title="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
  </Accordion>

  <Accordion title="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
  </Accordion>

  <Accordion title="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
  </Accordion>

  <Accordion title="Audio Processing Issues">
    * Confirm that audio URLs are accessible
    * Check audio download permissions and network connections
    * Verify audio save paths and permissions
    * Handle both regular and streaming audio URLs appropriately
    * Process multiple tracks in the same callback
    * Download both generated and source audio files as needed
  </Accordion>

  <Accordion title="Copyright and Content Issues">
    * Review error messages for copyright violations (code 400)
    * Check for content conflicts with existing works (code 413)
    * Ensure compliance with platform content policies
    * Adjust uploaded audio or prompts if flagged
    * Verify uploaded audio originality
  </Accordion>

  <Accordion title="Rate Limiting Issues">
    * Handle timeout errors gracefully (code 408)
    * Implement appropriate retry logic with backoff
    * Monitor API usage to avoid rate limits
    * Consider upgrading service plan if needed
  </Accordion>

  <Accordion title="File Management Issues">
    * Organize downloaded files by type (generated vs source)
    * Implement proper file naming conventions
    * Handle potential duplicate downloads gracefully
    * Monitor disk space for large audio files
  </Accordion>
</AccordionGroup>

## Alternative Solution

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

<Card title="Poll Query Results" icon="radar" href="/suno-api/get-music-details">
  Use the get music details endpoint to regularly query task status. We recommend querying every 30 seconds.
</Card>

***

> To find navigation and other pages in this documentation, fetch the llms.txt file at: [https://docs.apikley.ru/llms.txt](https://docs.apikley.ru/llms.txt)

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