How do I get the document ID (file_id)?

I’m hoping someone can steer me in the right direction. Ideally, I want to get any items with a particular tag from dynalist into todoist, so that I can integrate with pomodoneapp (a Pomodoro app). I was going to use integromat since they have dynalist integration, but I’m stuck at trying to locate the document ID (file_id) for a given document. Or a list of all file_ids.

Show me the URL of your item and I can tell you which part is the document ID.