There are 2 ways to pay for your SIP instalments:
1. Auto-debit (preferred): Once you register your NACH, the SIP amount will be automatically debited from your account to the Mutual Fund companies. You can still stop and skip your SIPs upto 1 calendar day before your SIP date!
2. Payment link: If your NACH is not registered, you will get a payment link 3 days before the SIP date to pay for your SIP instalment. You can pay via net banking or UPI.