Begonia lucerna / Alternative botanical names: Begonia 'Corallina de Lucerna'. Special handling: likes humidity. Does not like cold weather. Pinching tips and pruning outer stems in the growing season gives a bushier plant, good for hanging.
This is a good point about the window display: use the back space for INSIDE the store. Poketo has become a mainstay of the neighborhood and the local go-to gift store in their large, raw, colorful space.