in: query
name: sort_by
description: >
  Sorts items by ascending or descending dates. Use either `date_created` or `send_date`, not both.
schema:
  allOf:
    - type: object
      properties:
        date_created:
          type: string
          enum:
            - asc
            - desc
        send_date:
          type: string
          enum:
            - asc
            - desc
    - oneOf:
        - required:
            - date_created
        - required:
            - send_date