Wow! Four years...
We need to, at least, be able to write a new entry to leave a log.
very interested too
+1 for accessing scope read_comment / write_comment
+1Yes, Admin API order timeline comment PUT please!
+1. please add this feature
+1 - I'm surprised this hasn't be addressed at all by Shopify. Write API access would help speed up fulfillment significantly.
+1 for this feature in API