Use the name "APOS" as the logo. This will be displayed as a light box (not signboard) at many retail stores and need to be visible to public during the day and night.
The brand informs that courier services are available at the retail store advertising it. That customers can walk in to send a parcel from the store. The store will carry a different brand at the signboard and may co brand with APOS or have a light box by the side with APOS on it.