Facebook (Meta) orders support native exchanges

For Facebook orders created as of August 26, 2025, you can now add exchangeLineItems as an input in the returnCreate mutation as you do for other orders, eliminating the need for workarounds when handling exchanges for Facebook orders.

Additionally, Facebook orders also support return fees as of the same date. This change applies to all supported GraphQL API versions.

Exchanges and return fees remain unavailable for Facebook orders placed before this date.