Audiobooks API to Push

[junal]

I'm inquiring about the Spotify Audiobooks API and its new mechanism. Spotify has provided Audiobooks content through its API for quite some time, but they're soon discontinuing it in favor of a new method called "Push." In this new approach, they'll send metadata and audio files directly to publishers' storage servers. My client has utilized the API to sift through over 300k titles, utilizing approximately 2k of them. With the introduction of this new mechanism, is it necessary for him to store the entire library of 300k titles, or can he filter and store only the titles required to supply to users? This uncertainty is hindering our progress. Any advice would be appreciated.