With this endpoint, you can inquire about the status of a source upload job.

• If the value of the 'status' attribute is 'pending' or 'processing', you
  should check this endpoint again later.
• If the 'status' is 'failed', the content has failed to be uploaded to the
  resource.
• If the 'status' is 'succeeded', you can get more details about the number
  of strings created, deleted, skipped and updated in the details attribute
  of the response.