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Sometimes, you may want your services to be able to talk to each other in an authenticated manner, and even perform some authorization. This is not easy to do and you might have scratched your head a bunch about how to do it. In this post I’m going to show you how to do something like this using hashicorp’s Vault. At the end of this post you’ll be able to issue and validate authorization tokens to make sure your services communicate in an authenticated and secure manner.