Ingenico ePayments
PostFinance
https://e-payment.postfinance.ch
Moreover, they use a shared merchants database, and it is impossible to use the same username (PSPID) in the both systems:
Barclaycard uses the same merchants database too.
I was never registered in it before (but is registered in PostFinance and Ingenico ePayments), but Barclaycard claims: «The PSPID you have chosen is already in use!»
