You can think of Google Shopping as a handy tool to showcase your products to the user in a very clear manner. While previously you had to entice users with text ads to your webshop, now you can give an idea of what you have to offer at a glance. As most people loves visuals, this certainly works better than text.Create your Google Merchant account
The rest of this article is more practical, so if you don't have a Google Merchant account, make sure to create one via this link
.Prove that you are the owner of your webshop
Google will not send traffic to a webshop that you don't own. Therefore you will have to proof to Google that you are the owner. The easiest to do, is by setting up a Google Analytics account, add the Google Analytics ID to your popup shop (in Sayl Retail), and then tell Google to check via the GA account.
In Google Merchant center, choose Business information, go to website, copy the link of your popup shop in the Website URL, and click on "I have a Google Analytics account".