'Get client approval identified by approval id, client id and username.'

@Category('User')
@ArgsType(api_user.ApiGetClientApprovalArgs)
@ResultType(api_user.ApiClientApproval)
@NoAuditLogRequired()
@Http('GET', '/api/users/<username>/approvals/client/<client_id>/<approval_id>', strip_root_types=False)
def GetClientApproval(self, args, token=None):

    raise NotImplementedError()
