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Version: 1.x

API04004: Missing Response Data

What This Means​

The server responded successfully, but the response is missing expected data. The JSON is valid but doesn't contain the information the POS needs.

Common Causes​

  • Empty results — No data matches the query
  • Permission restrictions — Data filtered due to permissions
  • Plugin filtering — Another plugin filtering API responses
  • Version mismatch — API version differences
  • Database issues — Data not present in WooCommerce

How to Fix​

1. Verify Data Exists​

Check in WordPress Admin:

  • Are there products in WooCommerce?
  • Are there customers to load?
  • Does the specific item exist?

2. Check User Permissions​

Your user may not have access to all data:

  • Verify user role capabilities
  • Check POS access settings
  • Try with an administrator account

3. Check API Response Filters​

Some plugins filter REST API responses:

  • Disable filtering plugins temporarily
  • Check for custom API filters in your theme
  • Review security plugin settings

4. Update Both Components​

Version mismatches can cause issues:

  • Update WCPOS plugin
  • Update the POS application
  • Check for compatibility notes

5. Check WooCommerce Data​

In WooCommerce:

  • Verify products are published (not draft)
  • Check if items are marked as visible
  • Ensure data isn't corrupted

Empty vs. Missing​

  • Empty response — Valid response with no results (may be expected)
  • Missing fields — Response lacks required data fields (this error)