A simple approach in learning about GST Payments :

Normally as soon as, you are done with GSTR-1 and GSTR-2, GSTR-3 asks you to proceed for GST payments. But upto 31-03-2018 GST needs to be paid along with GSTR-3B Return filing. (Amendments: Which has now been extended till June 2018). One can also claim refunds by filing online all the applicable refund forms.