The following is a list of compatible shopping carts / e-stores:

Cart/eStore Name Tutorial Payment Module PIN Support Commercial(Paid)/Open Source(Free)
Monster Commerce / Pro E-CommerceTutorialBuilt-in NoCommercial
Zen CartTutorialPayment ModuleNoOpen Source
osCommerceTutorialPayment ModuleNoOpen Source
VolusionTutorialBuilt-inNoCommercial
CartManagerTutorialBuilt-inNoCommercial
digiSHOPTutorialBuilt-inYesCommercial
USAeCartTutorialBuilt-inYesCommercial
SquirrelCartTutorialBuilt-inYesCommercial
iStoresTutorialBuilt-inNoCommercial