Is the pre-registration of credit card necessary in the GSTN portal for the GST payment?

Yes. The taxpayer would be required to pre-register
his credit card, from which the tax payment is intended,
with the Common Portal maintained on GSTN. GSTN may
also attempt to put in a system with banks in getting the
credit card verified by taking a confirmation from the
credit card service provider. The payments using credit
cards can therefore be allowed without any monetary limit
to facilitate ease of doing business.