Read application/pdf from Request Body - .NET CORE - asp.net-core

I am submitting a PDF file to my .NET CORE back-end.
The PDF was created using iText 7. I have added to the page few paragraphs and a PdfButtonFormField button with the following action
button.SetAction(PdfAction.CreateSubmitForm("http://localhost:4200/api/PdfSign/UploadPdfForSign", null, PdfAction.SUBMIT_PDF));
My endpoint gets the request. It looks like the request body has the binary data of the file but I have no idea how to read it.
Any help will be much appreciated!
** EDIT **
The goal is to get a PDF and sign it using iText.
The flow is - I am creating a PDF, adding the button to it and sends it to my customer. They do whatever they do on the PDF and send it back using the button from within the PDF.
I then want to read the details in my back end and sign it.
Hope this clears things.
Thank you,
Yaniv

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I know its late but my answer might help others. I also face the same challenge and implemented a custom solution based on Javascript and Since you are using web form so this solution will perfectly fits on your need.
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you can repeat the above code to add pictures from camera as much as you want, at the back-end these images are compiling and creating pdf document where each page have each images in sequence.
Once you are done, you can get PDF object in form of base64 object using below code that you can upload to any server.
pdf.output('datauristring')
above is only pdf part, you can find complete working example including camera part here Javascript Component to Scan Document

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Looks like you may be using Php in the back-end, if that's the case, the FPDF class should have everything you need to create your PDF:
http://www.fpdf.org/
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here my code
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.....
//setting header
.....
//then flush
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