Fulfillment v4.0.0 has been released

I’m happy to announce 4.0.0 release of Fulfillment service. It includes new functionality and performance improvements added in backwards-compatible manner but also contract breaking changes to Order endpoints.
See changelog for details.

Devs: please note that the next release we are working towards is 5.0.0 as we forecast some further performance improvements and we will remove defunct API.