# Overview (/global/en/docs/Terminal/FinancialServices/Overview)

## Financial services

The Financial Service module enables your application to initiate and manage core financial operations, including payments, refunds, and other business services supported by the payment application.

These services form the most critical interactions between the Sales System and the POI System.

Your implementation should adapt to the transaction types supported by the payment application, as different business scenarios may require different workflows and parameters.

A typical transaction flow is illustrated in the diagram below.

![](https://docs.newlandnpt.us/assets/_shared/cd10b0d9ef0d/service-payment.png)

> **WARN**
>
> If a financial operation presents its own terminal UI and a previous Display is still shown, abort that Display and wait for the Abort to complete before starting the operation. See [Device Display & Interaction](doc-id:afad6b34) for details.

### Supported Services

[Payment](doc-id:789ff18e)

Standard payment transacation.

[Refund](doc-id:07b40203)

Return the previous payment.

[Pre-Authorization](doc-id:96cf58b6)

Initial reservation authorisation.

[Pre-Auth Completion](doc-id:e9ac29b1)

Financial reservation completion.

[Authorization Adjustment](doc-id:6652497a)

Update reservation authorisation.

[Reversal](doc-id:660431ac)

Cancel a previous transaction.

[Reconciliation](doc-id:5173f468)

End-of-day batch settlement.

[Balance Inquiry](doc-id:9b591236)

Balance inquiry.