Unified APIs for dOOH? Other ad ops tools?

Hi there, I'm looking for advice. I run ad ops at a medium-sized dOOH company (5K screens). We're really struggling to keep up with all the various APIs that are needed to fully monetize our inventory via programmatic partners (Vistar, Hive, etc). It's not just the ad call APIs, it's also the venue management API, the audience APIs, and the like. Right now we do so much manually because it's too much too build.

Do you have any advice for tools that could make this easier? We have our own CMS and I feel like we're drowning in API work and inventory management. That's not even including the wave of CTV integrations coming our way.