async fn send_pipeline_execution_step_success(
        &self,
        input: SendPipelineExecutionStepSuccessRequest,
    ) -> Result<
        SendPipelineExecutionStepSuccessResponse,
        RusotoError<SendPipelineExecutionStepSuccessError>,
    > {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "SageMaker.SendPipelineExecutionStepSuccess");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(
                request,
                SendPipelineExecutionStepSuccessError::from_response,
            )
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response)
            .deserialize::<SendPipelineExecutionStepSuccessResponse, _>()
    }
<p>Notifies the pipeline that the execution of a callback step succeeded and provides a list of the step's output parameters. When a callback step is run, the pipeline generates a callback token and includes the token in a message sent to Amazon Simple Queue Service (Amazon SQS).</p>
rusoto/services/sagemaker/src/generated.rs