openapi: 3.0.0
info:
  title: Example of request body in 3.0
  version: 1.0.0
paths:
  /opinions:
    post:
      requestBody:
        description: 
        required: true
        content:
          text/plain:
            schema:
              type: string
            example:
              I think the V3 way is cleaner
          application/json:
            schema:
              type: string