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A short description of the issue:
The batchCreate call is missing fields such as mediaMetadata and contributorInfo

Your project number from the Google Developers Console:
N/A

The calls to the API that lead to the error. Include the sequence of calls, including request headers and body.
Do not include any personal information, authentication secrets, media item or album IDs.

curl -H "Content-type: application/json" -H "Authorization: Bearer $OAUTH_TOKEN"  -X POST
  -d "{new_media_items:[{simple_media_item: {upload_token:\"$UPLOAD_TOKEN\"}}]}"
  https://photoslibrary.googleapis.com/mediaItems:batchCreate

What steps will reproduce the problem?
1. Call batchCreate

What is the expected output? What do you see instead?  If you see error messages, please provide them.
mediaMetadata to be filled out
If all the criteria fits as per documentation, contributorInfo to be filled out.
Both are currently missing.

Please provide any additional information below.