This is a legal requirement. It is mandatory for KHAI KWAN to verify your identities. You must agree to provide documents such as passport or medicare card or driver's license to verify who you are when you are asked to do so. In most cases, we will task this to AUSTPOST (there is a fee involved about AUD 39) and they will respond back to us directly. You can download AUSPOST form here. In some cases such as overseas buyers, we will also need your banking details (last banking statement and address) to prove your identity or to do a Skype interview with you to satisfy our KYC requirements. This applies to both Vendors and Buyers. Our terms and conditions have this clause incorporated and must be agreed.