What is APX in banking?

Excuse me, could you please elaborate on what APX stands for in the context of banking? Is it a specific service, technology, or perhaps an acronym for a certain process or protocol that is used within the banking industry? Understanding the exact meaning and purpose of APX would be incredibly valuable for those who work in the field, as well as for those who are looking to gain a deeper insight into the intricacies of modern banking systems.