# Transaction Processing Guidelines

> Defines the transaction processing rules and flows for Alipay+ code-scanning payments in both User-Presented Mode (UPM) and Merchant-Presented Mode (MPM).

## For payment codes (UPM)

For detailed product introduction and integration guides, see [User-presented Mode Payment](https://docs.alipayplus.com/alipayplus/alipayplus/product_intro_mpp/product_upm_mpp.md) and [Integration overview](https://docs.alipayplus.com/alipayplus/alipayplus/integration_user_mode_mpp.md).

## For collection codes (MPM)

For detailed product introduction and integration guides, see [Merchant-presented Mode Payment](https://docs.alipayplus.com/alipayplus/alipayplus/product_intro_mpp/product_mpm_mpp.md) and [Integration overview.](https://docs.alipayplus.com/alipayplus/alipayplus/integration_merchant_mode_mpp.md)