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Access Token: A secure string that a client uses to access protected resources. An instance issues access tokens to clients that have a valid authorization grant. Each access token has a specific scope, lifespan, and other attributes. By default, an instance issues access tokens with a 30-minute lifespan in the scenario where the instance is the OAuth provider.
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Refresh Token: A credential that a client uses to obtain new access tokens without requiring additional user authorization. An instance issues a refresh token to a client when it is first authorized to have an access token. By default, an instance issues refresh tokens with a 100-day lifespan in the scenario where the instance is the OAuth provider.
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NodeMailer is a Node JS module that allows you to send emails from your server easily. It is a zero dependency module for all Node JS-compatible applications. The emails sent can be plain text, attachments, or HTML. Note that you can use Gmail accounts or Mailtrap to set up fake SMTP servers for testing.