# Overview

> Alipay+ SDK encapsulates and processes complex scenarios between merchant and Issuing Participant (also known as PSP).

Alipay+ SDKs consist of the client SDK and server SDK. The SDKs encapsulate and process complex scenarios between the merchant and theMobile Payment Provider (MPP).

The client SDK is used in the Merchant-presented Mode Payment and Auto Debit scenarios. For more information about the capabilities provided by client SDK, see [Alipay+ MPP Client SDK](client).

The server SDK is used in the Merchant-presented Mode Payment and Cashier Payment scenarios. For more information about the capabilities provided by server SDK, see [Alipay+ MPP Server SDK](server_integration).

The NFC SDK is used in the NFC payment scenarios. For more information about the capabilities provided by NFC SDK, see [Alipay+ NFC SDK](nfc).