# Introduction

Fee Management System (FMS) is Verestro's billing engine for fintech companies.   
The system collects billable data from external products through **Data Collectors**, calculates fees based on defined **Pricings**, and settles them either by **charging end-user's balance instantly** or by **storing the fee in the database** for later report generation (XLSX).   
FMS also provides an **Admin Panel User Interface** for managing pricing configurations without technical support.

#### Key capabilities

- **Automated B2B billing** — Aggregate fees and generate settlement reports for your business clients. FMS handles the calculation and reporting, simplifying your invoicing process.
- **Instant fee charging** — Charge end-users in real-time when they perform transactions. Every ATM withdrawal, card payment, or IBAN transfer becomes a revenue opportunity for your business.

<p class="callout info"><span style="color: #000000;">Instant fee collection is available to Partners integrated with Antaca.   
For more information about Antaca service, please open [<span style="text-decoration: underline;">this link</span>](https://developer.verestro.com/books/card-issuing-and-core-banking).</span></p>

#### How to connect with us?

There are two integration methods available:

1. **Plug &amp; play package**
2. **Standalone REST API integration**

Details of both integration options can be found in the following section: [Quick start guide | Verestro Developer Zone](https://developer.verestro.com/books/fee-management-system/page/quick-start-guide).