When Google Pay entered India's UPI market in 2017, it was competing against BHIM, PhonePe, and Paytm. All established, all functional, all doing the same thing.

Moving money between accounts is not a differentiated product because the path is identical, the fees are zero across the board, and one app looked just like the next without any clear difference.

So Google Pay did something that had nothing to do with payments. With each qualifying UPI transfer, they attached a little game, like those old lottery tickets you peel with your fingernail. So this started feeling like - Finish paying? Swipe across the screen, see what shows up. The cashback amounts were small, often just a few rupees. But, the Observer Research Foundation later documented what happened when payments stopped feeling like decisions.

The brain responds more strongly to uncertain outcomes than certain ones.

B.F. Skinner documented this in the 1950s. Rats that received a treat every time they pressed a lever pressed it steadily. Rats on an unpredictable schedule pressed obsessively, even when nothing came out.

Waiting lights up the brain more than having. The moment before the card is revealed is neurologically more intense than the reveal itself, which is why a ₹2 cashback scratch card still gets scratched every time.

Scratch cards need a trigger but Spin-the-wheel does not and that single difference decides everything.

The reward follows right behind, like a receipt made exciting. Google Pay saw it early, give once after the action, they return to do it again. CRED ties scratch card delivery to specific purchase events inside the CRED Store for exactly this reason. The nudge lives in timing, always linked to what just happened.

Spin-the-wheel works without needing prior behaviour. Nykaa brings it in the moment someone signs up but hasn't bought anything. The user spins, wins a discount code, and now has a concrete reason to browse.

Setting win rates too high. Teams assume users enjoy winning more, but when victory shows up eight times out of ten, surprise fades and the mechanic loses its pull.

Timing matters just as much. A scratch card delivered 24 hours after the qualifying action doesn't reinforce that action in the user's memory. It feels like a separate event, both need to land in the same session.

The full breakdown, including which mechanic fits which moment in your user journey, the configuration mistake that kills most campaigns, and the two metrics that actually tell you if it's working, is in blog post.

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