anchor.diff:  |CUSTOM_FIELD_DELETION
   |Occurs when a custom field is deleted
   |TENANT_CONFIG_CHANGE
  -|Occurs when a Tenant configuration is modified (For example catalog is created/updated or an overdue configuration is created/updated, etc.)
  +|Occurs when a Tenant configuration is modified (So, any changes to a catalog, overdue config, etc. within a tenant triggers this event)
   |TENANT_CONFIG_DELETION
   |Occurs when a Tenant configuration is deleted
   |===
  
positive.code: |INVOICE_NOTIFICATION
  |Occurs when an invoice is going to be generated for an account in the future (Can be used to notify customers about upcoming bills)
  |INVOICE_PAYMENT_SUCCESS
  |Occurs when an invoice has been paid for successfully
  |INVOICE_PAYMENT_FAILED
  |Occurs when the payment for an invoice fails
  |PAYMENT_SUCCESS
  |Occurs when payment is successful
  |PAYMENT_FAILED
  
negative.code: |ACCOUNT_CHANGE
  |Occurs when a customer account is modified
  |BLOCKING_STATE
  |Occurs when there is a change in the state of an entitlement (It becomes BLOCKED or UNBLOCKED)
  |BROADCAST_SERVICE
  |Used to broadcast an event to other Kill Bill nodes (Typically used for plugin related events like plugin installation,plugin uninstallation, plugin start, plugin stop, etc. )
  |SUBSCRIPTION_CREATION
  