Changes to Count billing invoices

api operation id countNativeInvoices removed and replaced with countBillingInvoices

added the new optional query request parameter past_due

added the new optional query request parameter provider_type

added the new optional query request parameter q

added the new optional query request parameter status

added the optional property params/past_due to the response with the 200 status

added the optional property params/provider_type to the response with the 200 status

added the optional property params/q to the response with the 200 status

added the optional property params/status to the response with the 200 status

endpoint added