API:Filerevert

Token
To revert a file to an older version, a CSRF token is required. The CSRF token is the same for all pages, but changes at every login. CSRF tokens can be obtained via   with   (MW 1.24+). For older versions, you can use  or  to get an edit token.

Error Codes
In addition to the err>API:Errors#Standard error messages|usual stuff: