anchor.diff:  |===
   |Action   |Result   
   //-------------
  -|Create a subscription for the `standard-monthly` plan on `2021-09-17`  |Invoice generated for `$24.95` corresponding to the `standard-monthly` plan
  +|Create a subscription for the `standard-monthly` plan on `2021-09-17` (current date) |Invoice generated for `$24.95` corresponding to the `standard-monthly` plan
   |Trigger invoice dry run with target date `2021-10-17`   |Invoice generated for `$24.95` for `2021-10-17` to `2021-11-17` corresponding to the `standard-monthly` plan
  -|Create a subscription for the `standard-annual` plan on `2021-09-17`   |Invoice generated for `$275` corresponding to the `standard-annual` plan 
  +|Create a subscription for the `standard-annual` plan on `2021-09-17` (current date)  |Invoice generated for `$275` corresponding to the `standard-annual` plan 
   |Trigger invoice dry run with target date `2021-10-17`   |Invoice generated for `$24.95` for `2021-10-17` to `2021-11-17` corresponding to the `standard-monthly` plan  
   |Trigger invoice dry run with target date `2022-09-17`  |Invoice generated with two invoice items corresponding to both plans for `$299.95`. 
   |===
  
positive.code: |===
  |Action   |Result   
  //-------------
  |Create a subscription on `2021-09-10`   |Invoice generated for `$24.95` for `2021-09-10` to `2021-10-10` 
  |Trigger invoice dry run with target date `2021-10-10`    |Invoice generated for  `$24.95` for `2021-10-10` to `2021-11-10`  
  |Trigger invoice dry run with target date `2022-05-10`    |Invoice generated for  `$24.95` for `2022-05-10` to `2022-06-10` 
  |===
  
negative.code: 
  === Subscription Billing Alignment
  
  When `SUBSCRIPTION` billing alignment is specified in the catalog, each subscription is invoiced separately as per its bill date. 
  
  [NOTE]
  *Note:* `SUBSCRIPTION` billing alignment applies even for subscriptions that are part of the same subscription bundle. So, if a subscription bundle consists of a base plan and an addon plan, the addon plan will be invoiced as per its own date and NOT be aligned with the base subscription billing date.
  
  This example uses the  https://github.com/killbill/killbill-docs/blob/1a945188c0ef53a3c7f797b4890514d35c09c46f/catalogs/subscription-billing-alignment.xml[Subscription Billing Alignment] catalog. It specifies `SUBSCRIPTION` billing alignment.
  
  