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Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement. No serious private advertisers ask for a down payment before you meet. Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
There isn't a specific "HIPAA Certification" in the sense of a formal certification procedure offered by an official authority as of January 2022, when I last updated my understanding. A federal law in the United States called HIPAA (Health Insurance Portability and Accountability Act) was created to protect the confid...