Provide clear information about your data processing and legal justification in your privacy policy.

You need to tell people that you're collecting their data and why (Article 12). You should explain how the data is processed, who has access to it, and how you're keeping it safe. This information should be included in your privacy policy and provided to data subjects at the time you collect their data. It must be presented "in a concise, transparent, intelligible and easily accessible form, using clear and plain language, in particular for any information addressed specifically to a child."