When you are on your Halifax Internet Banking next time, remember to click on the Cashback Extras section and opt in to the deals...
The way it works is, when you opt in for a deal and when you use your debit card in the store/online at that opted in retailer you get cashback as detailed on Halifax's website.
(Be aware the cashback is only paid on the first transaction at that retailer after you opt in, with your debit card.)
This month I have cashback deals as below which I have opted in:
8% Pets At Home
10% Hilton Hotels
15% Gourmet Burger Kitchen
10% In N Out Servicing
12% Shell Petrol/Diesel
There were also others for Hungry House Takeaways, Photo Frames and Waldorf Hotels.
It seems to come and go, as some month's I have rubbish deals and others like this month, I get great ones. I am due to do a big food shop and will now go to Morrison's and might even do one at Waitrose later in the month!
Remember when you are in the shops, there is very little point asking the staff about this deal or quering when the cashback will be paid, as the deal is dealt with directly by Halifax and they pay the cashback based upon your debit card transaction history. The cashback usually takes about 4 weeks to be paid.