Can you provide a few more details on what you're trying to do?
Creating orders through our Order API won't require you to worry about either of these tokens as these are generated on Shopify's side for each action (cart creation and checkout creation, neither of which happen when creating only an order).
If you use Order API, you will have to:
So you can't just simply create Orders without doing a BUNCH more work on other (unrelated) things. The checkout API neatly calculates taxes and appropriate shipping rates for you.
If these were supported in the Order API, it would be lovely though. This is by far my biggest pain point in the Order API.