Stocard does not collect any data on your purchases. We only receive anonymous statistics of our users' behavior in the Stocard app. For example, how often our users open the app. Thereby, we gain valuable information that helps us improve Stocard for you.
Moreover, when using the Stocard Backup, all data transmission as well as personal and critical information is encrypted to ensure the safety of your data.
Please also note that choosing to log into your Stocard Backup account via Facebook or Google+ does not mean that Facebook or Google will have access to your card data in Stocard. Instead, it simply means that you can use your Facebook or Google login credentials to access your backup account.