How to accept payments without a registered business

Hi viners! First time founder here, building a SaaS business. I am still validating the problem statement and haven't registered the company yet.

The MVP is ready and I am reaching out to some early customers to sell the subscription.

How do I accept payments within India and internationally without registering the company?

One such solution I found is Razorpay payment for freelancer. Has anyone used it? Or know better solutions?