Halliday & Matthiessen (2014: 306n):
Order, promise and other such processes can be construed with a Beneficiary. With promise this Beneficiary is the Receiver of a ‘verbal’ clause, but with order this Beneficiary is more like the Client of a ‘material’ clause denoting the creation of goods or the performance of a service; for example: You felt alright on Friday ’cause you ordered yourself a nice big pizza (cf. you ordered a nice big pizza for yourself). Here the ‘Receiver’ would be represented like a circumstance: you ordered yourself a nice big pizza from the waiter.