Card payments

Hello!

A silly question regarding payment card. I just got my Bibance Visa. I put the payment settings so that only EUR payments were allowed. However, I had both EUR and BNB in my pay wallet. Today I made my first payment and turned out that card paid my purchases in BNB.

Thus my questions are: 1) Can I pay only in Euros and still receive cash back in BNB? 2) In order to increase my cash back %, should I hold BNB in the pay wallet or can I hold them in my spot wallet?

After each BNB payment, I should fill in a tax report and obviously I want to avoid the hassles