What steps should I follow to successfully generate an e-invoice?

You should follow below steps to successfully generate an e- inovice through BUSY:
 Make sure your BUSY model as e invoice can be generate in Standard/Saffron/Enterprises/Emerald model only.
 Step 1: Login on Eway bill portal through https://ewaybillgst.gov.in/login.aspx 
 Step 2: In menu select registration option.
 Step 3: Click on 'FOR GSP'
 Step 4: A window will be appear and ask to send OTP, Which you will get on your registered email and mobile no.
 Step 5: Verfiy OTP.
 Step 6: Click on add new option.
 Step 7: Mention GSP provider company name as webtel electrosoft pvt. ltd and pinnacle teleservices pvt ltd.
 Step 8: Specified 3 character in user name 
 Step 9: Create password and re check it.
 Step 10: Save it .
 Step 11: In BUSY, Go in administration and select configuration.
 Step 12: Click on features/options and select GST/VAT.
 Step 13: Then enable e invoice reuired 'Y'
 Step 14: Mention station and pincode.
 Step 15: Click on GSP configuration option.
 Step 16 : Define the GSP ID user name and password which you have created through portal.
 Step 17: Validate and save the configuration.
 Step 18: Go back from GST/VAT and from features/option.
 Step 19: Under administration select confioguration then click on voucher series configuration.
 Step 20: Select relevant voucher type and series.
 Step 21: Click on voucher configuration and enable generate e invoice after saving option.
 Step 22: Go intransaction create a voucher and after save it will ask for 'Do you want to create e invocie'
 Step 23: Select 'Y' and click on automatic.
 Step 24: Check all possible erros before generate.
 Step 25: Then generate it.
 For automatic generation of e invoice BUSY License Subscription must be activated.