Word for a command in a business-to-business transaction

Question

Consider two companies already being in business; having some sort of contract. Now company A officially orders company B to do something. (E.g. destroy some documents, which company B stores for company A)

What is a good word for this command?

Command does not seem fitting in a business context. Request might be better, but feels a bit weak, because company B has to comply under the existing contract. Order—I feel—does mean something different in a business context (as opposed to in a military context). An order can be placed, e.g. and then some delivery of goods is expected, but maybe my own experience as a consumer is simply too narrow?

I would prefer one short word if possible. Usage in a sentence would be, e.g.:

Your command has been submitted successfully.

Destruction order would be another possibility (though not as short as I would like). There I really can not say if it fits.

Answer 1

Perhaps instruction in this context. Lexico says

instruction
NOUN

1 (often instructions) A direction or order.
I have sent an instruction to our solicitor.

When I was involved in the building industry, the official term for a written direction from the Architect to the builder was an "Architect's Instruction."