I currently have a New World Club Card, that earns Fly buys points on purchases. I got this card for the Club Card discounts New World offers on grocery shopping rather than Fly buys points.
I also have a Debit card from my bank that I make the grocery purchases with.
I recently found out I can link my Fly buys account directly to my Debit card, which will save me having to scan the New World Club Card and my Debit card when buying groceries.
What are the security risks (if any) by doing this?