It's still the case that you pay less in the app. You get 'coins' for a daily check-in, which are automatically(?) applied as a discount. Most items either don't actually use them or only give you a pointless 1% off or something, but I've gotten a $12 microcontroller for $5, for example. I think some coupons are app-only, too (though most aliexpress sales are fake and are better thought of as the normal price).

>You get 'coins' for a daily check-in, which are automatically(?) applied as a discount.

This should be illegal