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I am doing a function to evaluate a transaction between a client (company) and his client (end consumer). Then an email/sms is sent to the final consumer with a link for him to evaluate the transaction quickly by cell phone. I thought to make the url fall straight into the transaction without asking login, but to have a minimum of security, I thought to identify this transaction in the link by UUID or Hashmd5 of some data of this information.
What would be the pros and cons of each solution? What is the best package for UUID in same or general php?