Unfortunately, the Anedot platform does not have the ability to create a merchandise store at this time. Anedot can also not be used as the payment processor for Shopify or Woocommerce.
We are considering this functionality in the future though and you can upvote that feature request here.
However, some Anedot customers find that Items within our Campaigns product can provide the functionality they need to sell items like t-shirts. You can check out our help article on how to use Items to do that here.
Here's an example of what a finished page could look like: