PAYTM is one of the best app nowadays.i think the popularity of this is thouching skies due to currency change in India.it is easy to handle as smartphones have become a need these day and about 90% people use internet so this app helps a lot to carry out transactios online.people who were out of currency used paytm to pay all the bill n charges everywhere.the security level is amazing coz no one can easily hack or use our ptmaccout to pay their debts.even frm tge small stores to big mall paytm is used everywhere as a mode of payment .it has its best share in converting India to digital India.Best app try once n u will love it!