You can Filter your Customer List and DOWNLOAD your customer database into a CSV file.
The information contained in this file is as follows:
Last Booking Date
Marketing Permissions - This will have the date that the customer opted into Marketing permission. If the date is 01/05/2018, the customer will have opted in before GDPR changes on the 25th May 2018.
If you've set up extra marketing preferences at venue group level, these will appear in Column L on-wards with the date that the customer opted in.