Currently our integration is changing to upload all transactions from Cloud POS, which allows automations based on retail sales (if those items are live in the ecommerce platform). For example sending an email populated with accessories for those who have recently purchased a bike. All customers will be moved to this model in the June 15th Ecommerce release.
Mailchimp has limited analysis fields related to orders which has meant those customers already using this feature cannot create different automations for retail, C&C and mail order (ecommerce) orders. We're adjusting the integration to upload 'fake' products on transactions so you can alter automations based on the type of order.