Lot's of websites have a link to the shopping site or a reservation site where your customer can actually purchase your service online. You can set up this kind of button as well on your own simplebooklet microsite.
When tapped, it will open a new tab in the browser with whatever URL you pointed to.
Add A Custom ButtonTo add a custom button, do the following:
In the slideout that appears, enter in the URL you want the Customer to be taken.
You can also enter in a different name instead of BUY (Buy is the default text that appears in the menu). You could use something like Reserve, login, signup, Shop, website, store, etc.