Change properties' visibility to protected.
Merge pull request #962 from kayue/patch-4

Change PurchaseListener properties' visibility to protected.
Configurable purchace redirect route
Fix NoopInventoryOperator after Interface was updated. Also adding spec to prevent this from repeating.
Merge pull request #967 from Richtermeister/fix-noop-inventory

Fix NoopInventoryOperator after Interface was updated. Also adding spec ...
Separate purchace listener flash
Moved PurchaseCompleteEvent to core
Fixed unique order number error
Merge pull request #953 from umpirsky/fix/separate-purchace-listener-flash

Separate purchace listener flash
Merge pull request #963 from umpirsky/feature/configurable-purchace-redirect-route

Configurable purchace redirect route
Merge pull request #904 from umpirsky/fix/last-order-number

Fixed unique order number error
Introduce StackPHP & middlewares usage to improve code