Mobikwik is quite popular for online recharge.i have used this service from a couple of time with success.Mobikwik is digital wallet that focusus on recharges and bill payments.The only things missing now in that you can not send money to other wallet .So someone who using paytm wallet is not connected to you, The offline payment are a big drawvof using mobikwik though for instance , cafe coffee day accept payment via mobikwik and the ptocess is fairly simple .Thankyou