I am using Infinia directly at the POS machine of my kid's school and getting the RP.
-If the Institute has a POS machine, then go and swipe, that's the easiest way.
-If they have a payment portal where you can enter your CC and do the payment, that is also fine.
In my case, I wanted to use DCB (before having Infinia) and the portal was accepting only visa and master, hence I called up the school and asked whether they have a POS (luckily they had). And I directly paid at school and continuing to do so.