I have a freelancer that is working on an automated bill pay app. We take user login credentials for different billing sites and save them in the database. We also store payment information for the user to pay with. We use automation to log the users in and make bill payments. We need some advice on security and encryption. We are using React Native front end and Django backend. Just looking for a 20 to 30 minute chat session on Freelancer. We were thinking about using HashiCorp Vault so if you have any knowledge on this that would be helpful also.