def _merge_notebooks_feedback(notebook_ids, checksums):
    """
    Returns a list of dictionaries with 'notebook_id' and 'feedback_checksum'.

    ``notebook_ids`` - A list of notebook IDs.
    ``checksum`` - A dictionary mapping notebook IDs to checksums.
    """
    merged = []
    for nb_id in notebook_ids:
        if nb_id not in checksums.keys():
            checksum = None
        else:
            checksum = checksums[nb_id]
        merged.append({'notebook_id': nb_id, 'feedback_checksum': checksum})
    return merged