Fixing WordPress Product Import Issue

I am experiencing an issue with importing product data from a CSV file into my WordPress site. The import function does not properly store the download_url field in the site's database. I need an experienced WordPress developer to review my import scripts and correct the issue to ensure that the download_url is correctly saved.

Current Setup:

The site runs on WordPress with a custom product import functionality.

This functionality is part of a custom plugin developed by us.

The import function is structured in two key PHP files:

importpage.products.php: Handles file uploads and processes CSV data.

import.products.php: Inserts the imported product data into the database.

The CSV file includes a download_url column with valid URLs.

The import function successfully imports all other product data except for download_url.

Issue Description:

The download_url field is present in the CSV file but is not being stored in the WordPress database.

The download_url is not appearing in the product meta fields.

When download_url is not empty, it must also populate the supplier field with dp.

Attempts to manually modify the import scripts to include download_url have not worked.

No errors are displayed, and database insertions appear to be occurring, but the download_url data is missing.

Expected Outcome:

Review and debug the existing import scripts.

Modify the scripts so that download_url is properly read from the CSV file.

Ensure that download_url is stored as a product meta field or in the appropriate database table.

Ensure that when download_url is not empty, the supplier field is automatically set to dp.

Verify that download_url is correctly associated with each imported product.

Provide a detailed summary of the fixes implemented and any necessary documentation.

Skills Required:

Strong knowledge of PHP and WordPress development.

Experience with WordPress database operations (wpdb and post_meta).

Debugging and troubleshooting PHP scripts.

Familiarity with CSV data handling and parsing.

Deliverables:

Updated PHP scripts (importpage.products.php and import.products.php) with the fix implemented.

Testing and confirmation that download_url is correctly saved.

Ensure supplier is set to dp when download_url is not empty.

A brief explanation of what was changed and why.

If you have experience with WordPress product imports and debugging database-related issues, please get in touch with a proposal and estimated timeframe for completion. Thank you!