You don't follow about it seeing as you got the free case. That was one of the perks you get when reservation the S5 on and after April 11th. The ONLY ones that got the $50 suretap master card were the ones that reserved the device from February 25th until April 10th. Only those reservations got that. After that the ones that reserve got a free S-View case worth $50 so is the same thing basically.
To use suretap with NFC turned on, should I have 'android beam' or 's beam' or both turned on too? I Completed the card registration and it shows my prepaid card balance of $50. I tried to use it to buy a coffee at Timmies, and it didn't work. I pressed the "Pay Now" button, it showed the countdown, and after several attempts of tapping my phone on the debit/credit terminal the terminal showed an error msg telling me to swipe or insert the card. I tested the terminal by tapping it with one of my physical cards and it worked.
From what i know you ONLY need to have NFC turned on as the S-beam is for something else. Suretap only uses NFC not anything else. It could be that the terminal you went too wasn't accepting it or had issues.