Troubleshoot Google Merchant Integration Issues

I'm in need of a skilled developer to assist with Google Merchant integration for my custom e-commerce website. The primary issues I'm facing are with product syncing. Additionally, I'm encountering error messages during the syncing process.

Key Tasks:
- Troubleshoot why products are not syncing properly
- Address error messages that are disrupting the syncing

Ideal Skills:
- Proficient in Google Merchant integration and e-commerce platforms
- Skilled in resolving product syncing issues
- Experience with custom e-commerce platforms
- Detail-oriented to identify and address error messages

Please note that I do not use any plugins or extensions for the website. Your help in resolving these issues is greatly appreciated.