AUTHENTICATED scope can add a comment to the own post or
to a post created by any user from the network by executing of the createPostComment mutation.
The current API user will be set as an author.
Mutation has a single required incoming argument - data that represents PostCommentCreationInput object:
Extra content (like a training, a certificate or a badge) cannot be shared in a comment.
Also, you cannot add a comment to another comment (only posts can be commented).
Post object. Detailed description and the full list of available properties can be found here.