Shopify Google Shopping MPN and Error Correcting

I am looking for a Shopify expert to assist me with my Google Shopping MPN and error correcting. The ideal candidate should have experience with both Shopify and Google Merchant Center.

Google Merchant Center Account:
- I currently have a Google Merchant Center account set up

Specific Errors:
- I am experiencing specific errors in my Google Merchant Center
- The specific error I am encountering is missing or invalid MPN +GTIN

Skills and Experience Required:
- Experience with Shopify
- Knowledge of Google Merchant Center
- Ability to troubleshoot and correct errors in Google Merchant Center
- Familiarity with product identifiers and accurate shipping information