I need a network where different pharmacy databases connect to measure how many products of a particular brand were bought by the same user and thereby give them a discount. The information that we are gonna use are CPF (brazilian ID), bar code, time stamp, number of previous products acquired and pharmacy that sold the product. This information must be in accordance with GDPR and guarantee the anonymity of the user, using for example the private fabric. Maximum term 10 days. The main objective here is the pharma brand to obtain all that information to give the maximum discount to the user.