Merchant Center's full product data specification page lists all the attributes you need to provide in order for your products to be listed in Shopping ads and free product listings.
Some attributes are required for all products, some are required for certain types of products (such as apparel), and others are recommended. Failure to provide a required attribute may prevent that particular product from showing up in Shopping ads and listings, whereas failure to provide recommended attributes may result in products showing up less frequently. Read through the entire document to make sure your products show up on Shopping ads and free listings.
The product data specification also provides guidelines for submitting high-quality data to Google. Fresh, comprehensive, and accurate product data will help attract customers to your products. Some best practices to avoid common data quality violations include:
- Provide clear and conspicuous pricing information.
- Provide the freshest availability status of your products.
- Provide complete and correct shipping information and costs.
- Show a product that is essentially identical on your landing page to the product data you submit to Google.