Using cc directly not possible and via wallet load then it's costly n not worth to do so
U can buy them a cc n give like virtual king said to get rewards
If u want to transfer then u can use money transfer apps n may be if luck is there u will get 1 or 2rs sometimes via cred paytm amazon pay
Amazon pay runs send money offer where u will get cb upto 10rs and this is every month so u can do by collecting the offer n max it out
Gpay hardly gives cb now a days. Same way for phone pe