Support for Invoice PDF

[tuarrep]

As described here: https://developer.intuit.com/app/developer/qbo/docs/api/accounting/all-entities/invoice#get-an-invoice-as-pdf

I've drafted a PoC in my fork: master...tuarrep:patch-2

Basically I allowed overriding headers (Accept must be application/pdf) and added an option to get result as Array Buffer instead of JSON.

It's not wrapped in a method, I use doFetch like this:

await QuickBooks.doFetch("GET", `/invoice/${id}/pdf`, {}, null, 
  {
    asBuffer: true,
    headers: { Accept: "application/pdf" },
  }
)

[Christian-Martins]

Up !