Integrating with AWS Textract

I am trying to integrate with AWS Textract (documentation found here: https://docs.aws.amazon.com/textract/latest/dg/textract-dg.pdf). Particularly I am trying to use the AnalyzeDocument operation first. I am getting the error highlighted below. Has anyone been able to integrate Appian with AWS?

I am using Appian 194 which already has the AWS Signature Version 4.

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    Certified Lead Developer
    in reply to Tejas Sakhardande

    Hello Tejas

    could you please add the screen shot for request body as well.

    i am trying to implement Aws Recoknition and getting the below error:

    HTTP/1.1 400 Bad Request x-amzn-RequestId: 5ad86fe3-6f3e-4180-9dfb-695372096ffa Content-Type: application/x-amz-json-1.1 Content-Length: 35 Date: Mon, 19 Sep 2022 19:52:21 GMT Connection: close

    {"__type":"SerializationException"}

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