The Samsung Galaxy S6 has the technical requirements in order to pay via NFC Near Field Communication. With "Samsung Pay", the manufacturer now provides the perfect app, with which you can pay at respective POS systems and machines with your Samsung Galaxy S6.
However, Samsung Pay is not installed at the beginning on the Samsung Galaxy S6, which is why you have to install it from the Google Play store:
Samsung Pay can be downloaded for the Samsung Galaxy S6 via the following link: Download
After you have installed on your smartphone Samsung Pay, you can use this as follows:
1. Open the Samsung Pay App
2. Add Credit Card
3. Unlock Samsung pay fingerprint scanner
4. Hold your Smartphone over the NFC terminal for example in a shop
5. The payment process with Samsung Pay starts
You know now in theory how to pay on the Samsung Galaxy S6 with Samsung Pay.