Pepper is middleware that lets point-of-sale software and payment terminals communicate. POS vendors, integrators and the IT departments of retailers and restaurants do not have to build a separate connection for every terminal type. PepperQik is the cloud service variant: the connection runs through a REST API and a web interface, the Integration Cockpit, used to roll out terminals, follow their status, manage users and view payment statistics. Pepper Library is the locally installed variant for PC-based tills, shipped as a .dll or .so file on the till PC; according to the vendor it also works offline.
Pepper is developed by treibauf AG, headquartered in Zurich, Switzerland; no parent company is stated. The website does not say where the PepperQik cloud service is hosted, so assume the headquarters country and ask the vendor for the hosting location. Switzerland is not an EU member state but is an EFTA country with an EU adequacy decision for data protection.