- listAllInvoices() concatenates pages in order, size=200 on each request
- listAllInvoiceItems(invoiceId) requests the nested /invoices/{id}/items
path and concatenates its pages
- Extends the existing GET-only / Authorization-header assertion to both
new methods (PAX8-08)
- listAllCompanies/listAllSubscriptions/listAllProducts multi-page concat
- size=200 param assertion, single-page no-infinite-loop case
- Assert every request is GET with Authorization: Bearer header