A useful distinction
A programme can define where its referral links may be used and how the publisher’s properties are identified. A rule for one channel should not be assumed to cover another. The actual programme documents supply the relevant scope.
Put it into practice
List the intended channels and compare each with current official terms. Ask the provider about uncertainties before publishing there. Do not infer permission for email, paid advertising or private messages from the fact that a website link was generated successfully.