Pricing Rules is a set of conditions that you can set on the rate cards, usage meters etc based on which you can define a computing logic to the invoices.
Pricing Rules in Togai are configurable using supported javascript operators.
With Pricing Rules, you can bring in flexibilities in your rating such as :
The case of a payment processor wherein, if the overall payment value during a month across all payment modes cross $1 million dollars, then provide additional 10% discount on the overall invoice
The case of a cloud contact solutions company wherein the company wants to provide a bundled offering where each license gets a free call usage of upto 1000 minutes per month and beyond that, there is an overage price
For more information on Pricing Rules, check out this link