Returns proof owner's download URL.

Request parameters

* denotes a required field

Parameter			Example	API version
SessionID*	The session Id obtained from doLogin()	string	7viklshodc6cnsh4s5vu75mqk0
FileID*	The file identifier	integer	418775
RecipientEmail	Email of the recipient for whom url should be returned	string	recipient@example.com	17.6

Response parameters

Returns a string representation of the download URL