How can I include a header for jsonlite paging

I'm wanting to combine the response to multiple calls, split by page, into one final result (then ultimately a data table to manipulate in Excel).

I was referencing the "Automatically combining many pages" portion of this jsonlite vingette and I can't figure out how to implement the "add_headers" like I do with httr's "GET()" while also paging through and combining.

I am very new to R, but I'm learning more and more as I fail, research, and resolve issues. However, this has me stumped as I'm sure I am missing some core understanding.