# Document History

This page describes the changes made to each release of _Alipay+ Code-scanning payment standards_.

**Dec 2022**

Released Version 1.1 of _Alipay+ Code-scanning payment standards_.

Including the following changes:

-   The document structure and setting of the navigation menu.
-   Modification of [User Experience Design Guidelines](../code_scanning_payment_standards_mpp/user_experience_design) and [Security Guidelines](../code_scanning_payment_standards_mpp/security).
-   Other minor editorial changes.

**Sept 2022**

Released the first version of _Alipay+ Code-scanning payment standards_.

It obsoletes its predecessor, the _Contactless Gateway Code Protocol_ (CGCP) series.