Restful API Newbie Question About Creating/Combining/Converting/Flattening PDFs

Hi, all,

Question for experts from a newb. This is what I'd like to do, but not sure if I can do it with Adobe APIs.

I have a client that generates a lot of documents and images. Formats are Word, Excel, Text, PNG. They also generate PDFs. Some of the PDFs contain annotations, comments and filled-in fields.

What we need is a RESTful API that can do this:

We send the API a pile of documents of various formats using HTTP POST. We tell the API what order the docs should be in. This "pile" can contain all the docs above including annotated PDFs.

The API converts everything it was sent into ONE single, combined PDF in the specified order. All annotations of any kind are "flattened".

Is this possible? If so, can someone point me to the API docs that would cover this? I use Postman and know how to work with APIs, but don't readily see anything in the docs here about submitting via REST, setting the doc order, flattening, etc. Thanks!