How to capture customer GST Number for GST billing

Store Design
1

HI Team,

I am ikangen Store owner from India. Currently, I am doing only India centric business.

Many of my customers are asking for GST Billing and I need to capture their GST Number while Checkout Process. Can Someone guide me how and where to do setting to capture the GSTN Details of Customer for GST Billing

2

Hi, I wish to do the same for my store.

Currently I have asked the customers to add the GSTIN next their company name in the checkout form.

Hope it helps!