Customers can be set up to be shared between your Magento ecommerce site and your MicroBiz Cloud system. You can limit customer scope so that they only show up in certain stores and you can set up customer types to limit which customers get promotional pricing.
The default 'Walk In' customer is automatically placed on each receipt. Walk In is just a way to say I'm not going to keep track of this customer. You can type an email address into the Walk In Customer email field and email receipts to walk in customers. The only limitation is that Store Credits and Work Orders need a real customer assigned to them. Otherwise you are free to use the walk in customer as much as you like.
Customer types are used by promotions to determine whether the customer qualifies for the sale price. This is a good place to make categories for special groups of customers such as 'Facebook Friends', 'Loyalty', 'Club Members'. You should also have a basic retail customer and perhaps an e-commerce customer to help you build effective pricing and incentive programs.
Customer Tax Class
Each Customer Type is assigned a single Customer Tax Class. Tax classes determine whether the customer gets charged sales tax. Don't worry if you don't charge sales tax in some of your store locations. Sales tax doesn't get charged unless the item is taxable, the customer is taxable and the goods or services are delivered in a taxable jurisdiction.
When you create a customer in MicroBiz or in Magento (with the MicroBiz plugin) you can determine whether the customer record will be shared between MicroBiz & Magento. When a Magento customer creates a new customer record on your web site it will be created in MicroBiz unless you turn this feature off in your MicroBiz >> Magento API settings.