Open L2 API interface is an abstraction of the card processing (alias L2. See also here More On Card Processing ), for EMV contact and EMV contactless systems. It is based on a simple set of primitives to ease L2 integration onto a payment application (alias L3).

That set of primitives supports Nexo Fast’s structures and dynamics.

What is not covered by OLA interface is:

• Pin pad management: refer to manufacturer’s SDK to integrated use cases related to pin entry. Most of the time, proprietary callbacks must be defined using specific software signatures

• Transit features: use manufacturer’s SDK to realize transit use cases. For example, if using Agnos Framework, refer to Callbacks API.