Customer First Name, Customer Last Name – used in reporting back to you which customers have opened your emails. We are in the process of phasing out this data collection.
Customer Email Address – used to validate an email address on file for deploying invites. This is only kept on file until an automatic invite is sent, and then it is deleted. We are in the process of phasing out this data collection.
Shopify Customer ID – the single identifier Shopify uses to represent a customer. This will be the only customer ‘data’ stored in our app in the near future.

We do not sell or reuse any data collected in the app. The data is collected as service to our subscribing merchants for their own use. As soon as our app is uninstalled, there is a process that removes all the data for that store from our app.