You must configure following objects before billing a customer's purchase:

  1. Settings on the Account and Account Locations for Billing.
  2. Define Billing Preference. 
  3. Configure Products.
  4. On the Proposals page, you can select products, adjust pricing, adjust billing settings, change bill preference, initiate approvals processes and you can automate the process to activate an order, create a Bill, and create revenue.
  5. Set Payment Terms.
  6. Add an Invoice Template.

  7. Verify Billing System Properties.