POS stands for Point of Sale (like a specific store location) which indicates that the purchase occurred by using your debit card, but it can also be the on-line transaction done via 3-D Secure.
Checking with bank, they said that Kirchstrasse transaction could be related to direct marketing subscription service ordered on-line.
Investigating further what I've found these kind of transactions are performed by 2BuySafe company registered at Kirchstrasse in Liechtenstein with went through the MultiCards on-line cashier which can be used for paying different variety of services (e.g. in this case it was polish on-line storage service called Chomikuj).
These kind of transactions can be tracked by checking the e-mail (e.g. in gmail by the following query:
after:2014/09/02 before:2014/09/02 Order).
Remember, that if you still don't recognise your transaction, you should call your bank.
I have found also some other people concerns about that kind of transactions who ask: Is 2BuySafe.com and www.multicards.com some sort of Scam?
Provided answer says:
MultiCards Internet Billing is a provider of online credit card and
debit card processing and payment solutions to many retailers
worldwide. MultiCards was one of the pioneer companies offering this
type of service since 1995 and is a PCI / DSS certified Internet
Payment Service Provider (IPSP) providing service to hundreds of
retail websites worldwide MultiCards is a registered Internet Payment
Service Provider and has implemented various fraud protection tools
including, but not limited to, MultiCards Fraud Score Tool and
'Verified by Visa' and 'MasterCard SecureCode' to protect card
holder's card details. 2BuySafe.com Is also Secured and Verified By
GeoTrust The certificate should be trusted by all major web browsers
(all the correct intermediate certificates are installed).
The certificate was issued by GeoTrust.
Entering Incorrect information can lead to a card being rejected as @
TOS 2BuySafe.com is hosted on the Multicards Server site