The seller can upload their product catalogue on Google Merchant Center. Based on that, subsequent ads (advertisements) could be created and can be displayed to their potential customers.
An active Google Merchant account.
Steps to upload your catalogue on Facebook
Step 1: Go to https://merchants.google.com/ --> Products (menu on left-side) --> Feeds.
Figure 1: Create Feed in Merchant Center
Step 2: Fill all the basic information.
Figure 2: Basic Information
Step 3: Enter name of the feed and choose an input method.
Figure 3: Name and input method Figure 4: Feed name and Schedule fetch
Step 4: Setup your catalogue feed.
Figure 5: Setup Page Figure 6: Name, schedule and copy your catalogue link and paste it as shown Figure 7: Your feed is visible under Primary feeds
Step 5: Check processing status and potential issues.
Figure 8: Check the process status Figure 9: Click on 'Fetch Now' Figure 10: Initiate feed processing Figure 11: Processing completed