post:
  summary: Request a message relay from a LightPush service provider
  description: Push a message to be relayed on a PubSub topic.
  operationId: postMessagesToPubsubTopic
  tags:
    - lightpush
  requestBody:
    content:
      application/json:
        schema:
          $ref: './schemas/apitypes.yaml#/PushRequest'
  responses:
    '200':
      description: OK
      content:
        text/plain:
          schema:
            type: string
    '400':
      description: Bad request.
      content:
        text/plain:
          schema:
            type: string
    '500':
      description: Internal server error
      content:
        text/plain:
          schema:
            type: string
    '503':
      description: Service not available
      content:
        text/plain:
          schema:
            type: string