Getting observation ID from photo ID

I’m currently writing a web app that provides a quiz to learn to distinguish between two taxa. It’s going quite well :)

I’m fetching the images from the taxon gallery to present them to the user. That means I have the taxon ID, but not the observation ID.

Now I can’t figure out how to effectively get the (or the first, if there are several) observation ID where that image appears. The API doesn’t seem to have that functionality, and I’d like to avoid scraping the photo page, where this information does appear.

any ideas? :)

cheers!

p.

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