Please note that this documentation is for the most recent version of this extension. It may not be relevant for older versions. Related documentation can be found in the documentation directory of the extension.
FAQ
Links for PayPal redirects are not absolute
Most probably a missing Entry Point for a domain in the site configuration - https://www.domain.tld/ should be used here
Products cannot be added to shopping basket
The route enhancers have probably not been configured. If page type shop.json: 1496773586 is not defined, AJAX requests cannot be routed.
If the shopping basket button still doesn't appear, you may have the static templates in the wrong order. Static templates must follow the order in the static template which defines content elements.
Documentation
TYPO3 Shop
This extension is a simple shop for TYPO3.