I've done a few of these, and only betway have so far refused to pay out and the cashback agent not helped. Some have taken 6 months, some 2 weeks, so don't depend on it coming. Made about £600 so far from just playing the required number of hands of blackjack then stopping irrespective of winnings and waiting for the cashback to track. With betway I had a PayPal deposit id, their own internal session id for when I played (from their CS), a list of every hand I played again from their CS and still had funds in my account yet they refused my claim saying they had no proof I'd played!
The deposited 15, can it just be left to rest in the account, while quidco finely pays out and then remove the original deposit?
recently quidco tracking is not reliable and it takes ages to claim any untracked transaction,
Hassle to get cash back. Avoid