Description: Returns a Base64 encoded string. This is useful for being able to transfer binary data as ascii.

Subject Type: String

Arguments: No arguments

Return Type: String

Examples: We can Base64-Encoded an attribute named "payload" by using the Expression ${payload:base64Encode()} If the attribute payload had a value of "admin:admin" then the Expression ${payload:base64Encode()} will return "YWRtaW46YWRtaW4=".