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Swaggerplus Callbacks

Define OpenAPI 3.x `callbacks` [Callback Object](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#callback-object) operation elements in an OpenAPI 2.0 API description document. This allows converting OpenAPI 2.0 to OpenAPI 3.0 for tools which work with OpenAPI 3.0. 
                        {"paths":{"/books":{"post":{"x-callbacks":{"myCallback1":"'http://callback.example.com?transactionId={$request.body#/id}':\n  post:\n    requestBody:\n      description: Callback payload\n      content:\n        'application/json':\n          schema:\n            $ref: '#/components/schemas/callback1Payload'\n    responses:\n      '200':\n        description: Callback successfully processed and no retries will be performed."}}}}}