Yes, businesses can be rated through both your experience and other member experiences. This can be done via Bartercard Search (https://search.bartercard.co.nz/) and is based on a star rating. Simply search for the member on Search and then click on their profile. This brings up five stars and you can then select your rating.
Each month on your member statement, you will also be provided with a list of members you've recently spent with and you can rate them here too.