How to connect local retail shop Euro payment system to GLS & TALER?

Hi!
Question:
How retail store can use TALER via GLS bank for Euro payments?

Case:
Will it be possible for a retail store with a business bank account at GLS and one of this card readers for cashless payments (PAYONE’s instore payment solutions: sorry GLS bank offers website only in German Praktische Kartenterminals für PoS bei der GLS Bank - GLS Bank) to use it’s equipment for TALER?

Will TALER and Euro ever work with the common Payment-Service-Provider, who run the cashless payment system?
If not, how TALER and Euro will work with GLS?

I found in forum GLS yet has no Exchange Operator:

Who (Exchange or Bank) needs to offer the retail shop the payment system, to use for TALER and Euro?

On what kind of solution is GLS working?

Thank you!

GLS will operate the Exchange itself.
@Ada please update the page GNU Taler Regional Availability

Updated! I was waiting for a confirmation so thank you for your update.