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Two-Factor Usage

#####Let's say you have a user that wants to enable two-factor authentication, and you intend to do two-factor authentication using an app like Google Authenticator, Duo Security, Authy, etc. This is a three-step process:

1. Generate a secret
2. Show a QR code for the user to scan in
3. Authenticate the token for the first time

Generating a key

Use Speakeasy's key generator to get a key.

var secret = speakeasy.generateSecret();
// Returns an object with secret.ascii, secret.hex, and secret.base32.
// Also returns secret.otpauth_url, which we'll use later.