Commission Based Model 
Google Shopping Feeds
There are three main types of shopping search engine models. In the commission based model, the entire transaction is completed on the original site, and a commission is paid for each sale. Amazon.com is a well-known example of this.
In the referral fee model, shoppers search and view products on the shopping engine but are redirected to the client's site to finalize the purchase. Lastly, there is the no-charge model, exemplified by Froogle, where no fees are required for inclusion.
Shopping feed services play a critical role in e-commerce by organizing and optimizing product data, such as titles, descriptions, prices, and images, into formats compatible with various shopping platforms. These services also manage data feed submissions to ensure product listings remain accurate and adhere to platform-specific guidelines.
