BigCommerce:
eCommerce Admin can choose how the customers should checkout in BigCommerce as shown in the below screenshot.

- If the customer decide to checkout as guest a customer account will not be created in BigCommerce. So in Acumatica the Sales Order will be imported with Generic Guest Customer provided in the Store Settings as shown below. If a customer decide to checkout with account details, then a customer account will be created in BigCommerce. And in Acumatica while importing this Sales Order, Commerce connector will create a new customer if the email address doesn't exist already and then link this customer to the sales order.
- Customers are allowed to checkout as guest but BigCommerce will create a customer account as soon as the order is placed and in Acumatica while importing this Sales Order, Commerce connector will create a new customer if the email address doesn't exist already and then link this customer to the sales order.
- Customers cannot checkout as guest in BigCommerce.

Shopify:
eCommerce Admin can choose how the customers should checkout in Shopify as shown in the below screenshot.

- Customers can checkout only as a guest, meaning customer cannot create a account in Shopify and hence when the Sales Order for this customer is imported into Acumatica, Commerce connector will use the Generic Guest Customer provided in the Store Settings form as shown below.
- If the customer decide to checkout as guest a customer account will not be created in Shopify. So in Acumatica the Sales Order will be imported with Generic Guest Customer provided in the Store Settings as shown below. If a customer decide to checkout with account details, then a customer account will be created in Shopify. And in Acumatica while importing this Sales Order, Commerce connector will create a new customer if the email address doesn't exist already and then link this customer to the sales order.
- Customers cannot checkout as guest in Shopify.
