What are the terms and conditions of your promotions? September 23, 2019 08:16 Updated Please see our Terms of Sale (Clause 11) for any information on ghdhair.com promotions. Related articles I am seeing a message that says my code is invalid, what does this mean? Can I use my promotional code with another offer? How do I register for an account on ghdhair.com? Do you offer a student discount? My code is saying it has applied but there is no change?