Refund under GST

Usually when the GST paid is more than the GST liability, a situation of claiming GST refund arises. Under the gST the process of claiming refund is standardized to avoid confusion. The process is online and is having time limits.
Excess Payment of tax due to mistake or by dealers like :-
1. Exporters
2. ITC accumulation due to inverted duty structure
3. Tax refund for international tourists
4. Refund of Cash ledger balances