1 - Add your products to the Story
To use add to cart, you need to connect your Google Merchant Center products first.
You can then add the products to your Story directly from the Storybuilder Shopping module.
2 - Select "Add to cart" CTA type
From the configuration panel, select "Add to cart" as the CTA type.
3 - Technical integration
The add to cart functionality requires the intervention of your technical team.
They need to follow this documentation in order to integrate the feature.