Convert document to base64 in response body for Web API Object (External client wants to call Appian Web API to retrieve documents)

Hi All,

We're interested in creating an Appian service using a Web API to return documents to an external client who will be processing these documents as part of a routine backend batch process.  While it's well documented how to convert a document to base64 in the request body for an outbound API call using an Integration object, I haven't found documentation on how Appian documents can be converted to a base64 string to return as part of the response body in an Appian Web API.  Curious if anyone else has had a similar use case and how they got around this.

Thanks!