There are 3 tiers in the APOLLO ecosystem:
Development For developers and service providers to create apps or integration.
Transaction The core mechanics built around the APOLLO smart terminal for payment transaction, including the payment app developed by Spectra, terminal apps for receipts, configs and so on, and the payment gateway for multi-processor service.
Service Supporting software and services. Value-added apps also included.
The following diagram shows the relationship between different party/ entity.