Open $portal_url (a client's supplier portal) and go to the list of submitted invoices.

Instructions

Open $portal_url (a client's supplier portal) and go to the list of submitted invoices.
For every invoice submitted in the last 90 days, read: invoice_number, po_number, amount, currency, submitted_date, status, payment_due_date, rejection_reason.
Save each invoice to the store keyed by invoice_number, and mark any invoice whose status changed since the last run.
Return three lists: newly paid, newly rejected (with the reason), and overdue (past payment_due_date and not paid).
If nothing changed, finish with an empty result and say so.

You provide “portal_url” each time you run it.