How to convert xstring data to PDF?

Hello,

My requirement is as below:

  1. I have a invoice pdf which is being generated from the smartform. (Driver program is written in the output type configuration – NACE transaction)
  2. I am using ‘CONVERT_OTF’ to get the xstring value of the smartform.
  3. I am sending the xstring data to third party system which does the validation of the invoice, sign it and returns the xstring of the signed PDF. (API call is done to the third party system)
  4. I want to use the xstring of the signed PDF and print the signed PDF or display the print preview of the signed PDF. (This should be done inside driver program)

Can someone guide me how to achieve the same?

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