Student or Learner
Your kitchen has a two-way refrigerator, which opens to the outside to accept deliveries.
What is the meaning of two-way refrigerator?
I've never seen one either, but apparently--according to the description you gave, it has two doors. One on the front of the fridge (a door that opens into your kitchen) and one on/at the back or side of the fridge (a door the delivery service has access to from outside your house).
Does that help?