I use gift cards to pay for my online Sainsbury's shops through a work discount scheme. I must pay at least £0.01 towards the shop using a credit/debit card, so I use my Tesco credit card. This means I'm regularly paying a very small amount with my credit card, usually less that £1. This flags up as suspicious on my Tesco credit card, so often the payment does not go through first time. Is there a way to add Sainsbury's to a safe list of some kind, so the payment always goes through?