Sometimes, a customer may advise you that they do not wish to be part of your Loyalty program.
To disable Loyalty for a customer follow the steps below:
Navigate to Customers -> Customers in Vend and find the customer.
Click on the customer's name and select Edit Customer.
Once here, untick Enable Loyalty for this customer. After you've done this, the customer will no longer receive Loyalty on sales.
If you would like more information on Vend's Loyalty feature, check out this article.