Can anyone walk me through getting 5% cashback @ Samsung via Samsung Pay?

Hi, I'm going to be making a purchase on Samsung soon and saw you can get 5% cashback using Samsung Pay+. I can't see where I can sign up to Pay+, has it been replaced by Curve now?

I created a Curve account and linked it to my Samsung Pay, do all I need to do is pay via my Curve card on Samsung Pay and I'll get the cashback? Or am I missing something?

Just want to make sure I have everything set up right before I try and make a purchase. Definitely don't want to lose out on £50+ cashback.

Thanks.