anchor.diff:  Price List:: One or more plans that have discount/special pricing. Price lists are defined in the <<Catalog,catalog>>.
   Along with price lists, you define <<Rules,catalog rules>> that specify which price list to use if a customer changes plans.
   
  +Pricing Tiers
  +Also known as "tiered pricing" or "price tiers."
  +{A common subscription and usage charge model where pricing changes are based on the incremental number of units that are purchased. For example, 1-5 users are charged full price and 5-10 users receive discounted pricing. A customer purchases 7 units. Units 6 and 7 are discounted, and the first 5 units are charged at the full price.}
  +
   [[Product]]Product:: A product or service that the customer can purchase (or rent/lease). A product can be associated with multiple <<Plans,plans>>, each plan specifying different ways the product can be purchased (e.g., a monthly plan and an annual plan).
  +
  +Proration
  +{Adjusting a customer's bill amount to reflect any plan changes made in the middle of a billing cycle.}
   
   == Q
   
   == R
  +
  +Refund
  +
  +{A refund returns money to a customer - as opposed to a credit, which creates a customer credit balance that may be applied to reduce the amount owed to you. For instance, refunds are used when a customer cancels service and is no longer your customer. Refunds can also represent processed payments that are reversed, such as a chargeback or a direct debit payment reversal.}
   
   [[Rules]]Rules:: The rules that determine how Kill Bill should behave when a plan is created, cancelled or changed. Also known as "catalog rules."
   
  
positive.code: 
  [[Account]]Account:: A record that contains details about the customer such as name, address, email address, phone number, etc. Also referred to as a "customer account."
  
  == B
  
  Billing Period:: The period for which the customer is billed. _Examples:_ `MONTHLY`, `ANNUAL`
  
negative.code: == Y
  
  == Z
  