Is it permissible to deal with the "Dubli" website, which offers cashback, coupons, and deals upon purchase?

It is not permissible to subscribe to the website if the subscription involves membership fees paid in the hope of profit through discounts on purchases or commissions for attracting customers, as this carries the meaning of gambling (maysir). Similarly, it is not permissible to subscribe if its system resembles a pyramid or network marketing scheme, due to the impermissibility of such a system.