Add in the LaTeX TOC an included PDF

From the documentation of pdfpages (page 6) it looks like there is an experimental tag called addtotoc. I think you'd use it like:

\includepdf[pages=-, addtotoc={<page number>, section, 1, <heading>, <label>}]

Where <page number> is the desired page number of the included PDF (edit) to link to, <heading> is the title in the TOC, and <label> is how you may \ref to the section.