You can add your Business details to Google My Business Free and can use that details to signup for the Google Pay for Business Account.
You need following details to add your Business to Google Pay for Business.
Your Business details like Name, Category, Business Owner Name etc
Business Location details
Business Mobile Number
Your Pan Card Number and Photo of your Pan Card
Bank Account Number and IFSC Code (You can use your Personal or Current Account)
Download Google Pay For Business App from Google Play Store and Install it in your Mobile, fill the Business address, Mobile Number, Pancard Number and Photo, Bank Account details etc.
Then complete the KYC Verification through a Video Call. Once the KYC is approve, your Business will be added to the Google Pay For Business.