A display fixture includes a shelf having a tester product receptacle, at least one first tester product assembly and an elongated channel. Other embodiments and related methods are also disclosed herein. The system also includes an integration tool for integrating the data item into the knowledge model that integrates the data item into the knowledge model only if the data item has not been previously integrated into the knowledge model. The user-terminal confirms the acceptance of the ordered goods by creating an approval for payment destined to the vendor terminal and forwards the approval towards the vendor terminal.