anchor.diff:  
   API:: The software intermediary that enables communication between two applications. For more information, see the https://killbill.github.io/slate/[_Kill Bill API Reference_].
   
  +//Account Balance:: TODO
  +
  +// Account Credit::TODO
  +
  +
   == B
   
   Billing in Advance:: A type of https://docs.killbill.io/latest/catalog-examples.html#_billing_modes[billing mode] in which you can charge for services that are provided at a later date.
  
positive.code: 
  == I
  
  == J
  
  == K
  
negative.code: 
  [[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).
  
  // Plugin:: TODO 
  
  //Proration
  //{Adjusting a customer's bill amount to reflect any plan changes made in the middle of a billing cycle.}
  
  