At Rupeezy, Buy Today Sell Tomorrow (BTST) is offered as our T+5 product — so if you are looking for BTST, use T+5.
Yes, it is allowed but you need to maintain sufficient margin i.e. 20% of the trade value in your account to execute order.
Note: DDPI is mandatory for this facility. How to activate DDPI (POA) for Your Demat Account ?