SingleFeed does not support Google merchant promotions feeds but we do support the "promotion_id" value in your regular product feed.
Google Merchant Promotions works in the following manner:
- Merchant creates promotions in the Google Merchant Center by using a data file or a web-based tool
- Merchant chooses whether a promotion applies to all products or specific products
- If promotion applies to specific products, merchant uses the "promotion_id" field in their regular product data feed to specify which products use which promotions
SingleFeed comes in at step 3. If you want to apply a promotion to specific products, you can add a new field called "promotion_id" to the feed you submit to SingleFeed. Then use the applicable promotion ID you specified in your Google Merchant Center account in this field.
More on Merchant Promotions: