---
agentTools:
  projectIndex: https://developer.bill.com/llms.txt
---

# New Guides section for the BILL Spend & Expense API

We have introduced Guides section documentation for working with the BILL Spend & Expense API. The BILL Spend & Expense API enables you to build with virtual card and expense management services for real-time visibility and control over the finances of a business.

| Guides                                                                                            |
| :------------------------------------------------------------------------------------------------ |
| [Spend & Expense API](https://developer.bill.com/v3/docs/spend-expense-api)                       |
| [Authentication with API token](https://developer.bill.com/v3/docs/authentication-with-api-token) |
| [Budgets and Users](https://developer.bill.com/v3/docs/budgets-and-users)                         |
| [Virtual cards](https://developer.bill.com/v3/docs/virtual-cards)                                 |
| [Transaction reporting](https://developer.bill.com/v3/docs/transaction-reporting)                 |