When music cover generation is complete, the system will call this callback to notify results. When you submit a cover generation task to the Suno API, you can use the callBackUrl parameter to set the callback URL. When the task is complete, the system will automatically push results to your specified address. Callback Mechanism Overview# The callback mechanism eliminates the need to poll the API for task status. The system will actively push task completion results to your server.
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: Cover generation task completed successfully
Cover generation task failed
Error occurred during task processing
Callback Method# Content Type : application/json
Timeout Setting : 15 seconds
When the task is complete, the system will send a POST request to your callBackUrl: {
"code" : 200 ,
"data" : {
"images" : [
"https://tempfile.aiquickdraw.com/s/1753958521_6c1b3015141849d1a9bf17b738ce9347.png" ,
"https://tempfile.aiquickdraw.com/s/1753958524_c153143acc6340908431cf0e90cbce9e.png"
] ,
"taskId" : "21aee3c3c2a01fa5e030b3799fa4dd56"
} ,
"msg" : "success"
} Status Code Description# code (integer, required)# Callback status code indicating task processing result: Status Code Description 200 Success - Request processed successfully 400 Validation error - Request parameters invalid 408 Rate limited - Timeout 500 Server error - Unexpected error occurred while processing request 501 Cover generation failed 531 Server error - Sorry, generation failed due to an issue. Your credits have been refunded. Please try again
msg (string, required)# Status message providing more detailed status description data.taskId (string, required)# Task ID, consistent with the taskId returned when you submitted the task data.images (array)# Array of generated cover image URLs, returned on success. Usually contains 2 different style cover images Callback Reception Examples# Here are example codes for receiving callbacks in common programming languages: Best Practices# Callback URL Configuration Recommendations
1.
Use HTTPS : Ensure callback URL uses HTTPS protocol for data transmission security
2.
Verify Source : Verify the legitimacy of request sources in callback processing
3.
Idempotent Processing : The same taskId may receive multiple callbacks, ensure processing logic is idempotent
4.
Quick Response : Callback processing should return 200 status code quickly to avoid timeout
5.
Asynchronous Processing : Complex business logic should be processed asynchronously to avoid blocking callback response
6.
Image Management : Download and save images promptly, noting URL validity period
7.
Error Retry : Implement retry mechanism for failed image downloads
Callback URL must be a publicly accessible address
Server must respond within 15 seconds, otherwise it will be considered timeout
If 3 consecutive retries fail, the system will stop sending callbacks
Please ensure stability of callback processing logic to avoid callback failures due to exceptions
Cover image URLs may have validity periods, recommend downloading and saving promptly
Usually generates 2 different style cover images for selection
Note handling exceptions for failed image downloads
Troubleshooting# If you don't receive callback notifications, please check the following: Network Connection Issues Confirm callback URL is accessible from the public internet
Check firewall settings to ensure inbound requests are not blocked
Verify domain name resolution is correct
Server Response Issues Ensure server returns HTTP 200 status code within 15 seconds
Check server logs for error messages
Verify interface path and HTTP method are correct
Content Format Issues Confirm received POST request body is in JSON format
Check if Content-Type is application/json
Verify JSON parsing is correct
Image Processing Issues Confirm image URLs are accessible
Check image download permissions and network connection
Verify file save path and permissions
Note image URL validity period limitations
Alternative Solutions# If you cannot use the callback mechanism, you can also use polling:
Poll Query Results
Use the get music details endpoint to regularly query task status. We recommend querying every 30 seconds. 