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To securely store passwords required to access an extenal site, use the HTTP datasource property → Secret Key Details. To use the password, specify For how to configure and use usernames and passwords for a site, see Authenticating for an API and  Secret Key and Local Secret. 
To reference:

• HTTP datasource instance Username and Password properties, use the variables:  %USERNAME% and %PASSWORD%.
• encrypted values, use  ${_datasource.

• key}

•   where key is the

•  Name of the secret key

• .