How do I register and configure the e-invoice integration?

To register and configure e-invoice integration, you need to first be eligible and registered for e-invoicing. Then, log in to the e-invoice portal and fill out the registration form. Once registered, please follow below steps to configure E-invoice In BUSY:
Step 1: Go to Administration menu then click on Configuration option. 
Step 2: Now click on Features and options then click on GST/VAT button.
Step 3: Now Enable the E-Invoice required option and click on configure button.
Step 4: Mention the From Place and pincode on then e-invoice configuration page.
Step 5: Then enable or disable the next option according to your need and click on ok button to save it.
Step 6: Then click on GSP configuration and You will see options of enter Webtel and pinnacle ID'S.
Step 7: Open E-Invoice Portal and click on registration option and enable e-invoicing then Click on left side e-Waybill portal using your existing credentials.
Step 8. Go to Registration for GSP and Authenticate yourself with OTP then Add New user.
Step 9. Choose GSP Name as Webtel Electrosoft Pvt Ltd or pinnacle finserv advisors private limited then Enter the appropriate Username and Password and add the user.
Step 10. Enter the same username along with prefix and password in the credentials table under GST/VAT GSP configuration in BUSY.
Step 11. Go to Voucher series Configuration and select voucher type and it's series in which you wants to generate E-Invoice.
Step 12. On the Right side Click on voucher configuration and Enable Transport window and E-Invoice option on right side.