The general principle in this regard is that para-banking activities, such as credit cards, primary dealer, leasing, hire purchase, factoring etc., can be conducted either inside the bank departmentally or outside the bank through subsidiary/ joint venture /associate. Activities such as insurance, stock broking, asset management, asset reconstruction, venture capital funding and infrastructure financing can be undertaken only outside the bank.
These include almost seamlessly integrated payment options which make life very easy for customers. I imagine most of us are happy to complete a purchase along with the related payment within a matter of seconds. Things get problematic when users become dependent on one particular provider because of the services offered within its digital ecosystem.