You do not need to authorize a transaction if you have provided a POA or DDPI to Arihant. However, if you have not provided a POA or a DDPI, you will need to provide an e-DIS to authorize your sale transactions. You can authorize all sale transactions in one shot, which will stay valid for one trading day.  

Pro tip: ⚡For lightning-fast executions, you can authorize all transactions at the beginning of a trading day and ensure you never miss a good deal. You can authorize up to 50 scrips in one go.