There was an app which was started for HikaShop and other shopping carts on that end:
www.hikashop.com/en/forum/9-commercial-j...ps-for-hikashop.html
jmobicart.com/
I couldn't find any information on appmachine regarding supporting additional ecommerce solutions. The only thing I could find is this:
Can I add features to my app other than those provided by AppMachine’s Building Blocks?
If you have thought up other features that you’d like to have in your app, a good developer can probably bring your idea to life. If you don’t have a developer nearby, get in touch with us at This email address is being protected from spambots. You need JavaScript enabled to view it.. We’ll introduce you to one of our partners.
So I encourage you to get in touch with them as we are not specialists of native mobile app development and thus we won't be of much help for that endeavor.