Pricing a commercial package
npm install pricing#### Description
Calculate the price for [Was Missing][wasmissing-url] package.
#### Arguments
- packageIndex
- 0 is the Free package
- 1 is the Basic package
- 2 is the Advanced package
- 3 is the Extreme package
- users
The count of users/coupons the buyer is buying for
- months
Buying for how many months
#### Returns
- The Price the user should see ( and pay )
[wasmissing-url]: http://wasmissing.com