You can read all Bills from Xero without passing any filters. However, to retrieve specific records based on any filter conditions, you can add the following filters as "queryParameters" as shown in the below example.

Learn how to retrieve specific records from Xero Bills using various filter conditions such as order, page, includeArchived, IDs, ContactIDs, Statuses, and InvoiceNumbers. This document contains useful code examples in Apex for implementing these filters 

Read

Create

Update

Bill

Docs - Breadwinner Xero

Breadwinner for Xero Docs

Getting Started

Invoice Configuration

Bill Configuration

Purchase Order Configuration

Guided Wizard Settings

Guided Wizard

Transaction Level Fields

Line Item Level Fields

Summary

Button URL Structure

Button URL Generator

Support

Custom Guided Wizard

API Overview 

Contact

Invoice

Purchase Order

Payment

Online Invoice

Get PDF Response

Item

Request

Response

Xero Contact Flow

Code Examples

Global API

Breadwinner Account Charts

Batch Invoicing

Advanced Topics

Breadwinner Setup

Requirements

ERD / Object Structure

Sync Documentation

Technical Resources

Getting Help

Version History

Param Name	Type	Description
order	String	Order by any element returned
page	String	Up to 100 invoices will be returned per call, with line items shown for each, when the page parameter is used. e.g. page=1
includeArchived	Boolean	E.g. includeArchived=true Invoices with a status of ARCHIVED will be included in the response
IDs	String	Filter by a comma-separated list of InvoicesIDs
ContactIDs	String	Filter by a comma-separated list of ContactIDs
Statuses	String	Filter by a comma-separated list of Statuses
InvoiceNumbers	String	Filter by a comma-separated list of InvoiceNumbers