Is a bank mandate absolutely necessary to invest in SIP with Upstox MF Platform?

It is absolutely compulsory to send Upstox a bank mandate the first time you start investing in SIP with Upstox MF Platform. It is basically a form that you sign which gives your bank the permission to deduct the SIP amount at regular intervals to pay toward the SIPs that you have invested in via Upstox MF platform.