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After the discussion here previously I have split my answer to this question into 2 answers as they are using different tools and have a slightly different approach.
What is the feeling on whether these should be 1 answer with 2 sections or 2 answers?
I think the 2 answers are great: more focussed, thereby easier readable and separately voteable.
I would event suggest adding a 3th which is the pure API answer, and explaining how the api messages support external IDs.