C4::External::OverDrive - Retrieve OverDrive content availability information
This module provides content search for OverDrive,
Returns 1 if all of the necessary system preferences for OverDrive are set.
Fetches an OAuth2 auth token for the OverDrive API, reusing an existing token in Memcache if possible.
Returns the token ( as "bearer ..." ) or undef on failure.
Jesse Weaver <pianohacker@gmail.com>