How do you complete a sale when no money has changed hands as we've swaped a car for a motorbike?

Kia Ora michael224,

Congratulations on your swap 😊

This is a Trade which has taken place offsite therefore neither party will be protected or covered by TradeMe should something go wrong. - The company don't operate a swap site. The Listing(s) are to be removed from the site now the vehicles are not available.

Steps to take to ensure you have a binding contract...

1. Ensure both parties conclude in agreement it's a fair trade.
2. Keep a signed record of the swap agreement terms & conditions, vehicles & parties involved, any other relevant information declared between both parties.
3. Advise NZTA - New Zealand Transport Authority/Waka Kotahi of the change in ownership upon swapping.
4. Ensure registration into the new ownership details are completed.
5. Cancel existing vehicle insurance policies and add new vehicle insurance at the time of the swap so you're covered before any party starts off in their new vehicle.
6. It's a good idea to check in with your local citizens advice bureau or lawyer to ensure all legal requirements are met incase there's a dispute after the swap, ensuring compliance with the law and that you have a legal binding agreement. 

If TradeMe require more information you should hear from a staff member.

Hope this Helps. - All the Best.