You can fetch a file in your repository using the API provided you know the commit ref and file path that you want to access.
|File contents for a particular path within a ref||GET||/project/repository/blob/ref/path/to/file/or/folder|
|File contents by blob SHA Git only||GET||/project/repository/blob/ref|
refin this context can be a branch name, tag name or commit reference.
pathis the location of the file within your repository