1/ Check the payment mode selected for order and the time at which order was placed.
2/ If net banking was selected and the order is less than T+1 day old then ask the user to pay using ‘<pay here>’ link.
3/ If net banking or UPI was selected and order is more than T+1 day old then suggest placing new order
4/ If an order is placed using NEFT/RTGS/OTM then explain the payment mechanism (pay here link would not be appearing).