This api request is for combining several pdf documents into single file.
To combine pdf files into single file just create a JSON array named pdfDocumentsAsBase64String with the base64 encoded pdf files.
"JVBERi0xLjcNCiW1tbW1DHUzEz <Content removed for readability>",
"JVBERi0xLjQNJeLjz9MNCjU4ID <Content removed for readability>"
Checkout Swagger documentation
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