# Document history The following table describes significant changes to this guide. If you want to be notified about future updates, you can subscribe to an [RSS feed](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/saas-multitenant-api-access-authorization.rss). | Change | Description | Date | | --- |--- |--- | | [Added details and examples for Amazon Verified Permissions](#doc-history) | Added detailed discussions, examples, and code for using Amazon Verified Permissions to implement a PDP. New sections include: [Implementing a PDP by using Amazon Verified Permissions](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/avp.html) [Design models for Amazon Verified Permissions](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/using-avp.html) [Amazon Verified Permissions multi-tenant design considerations](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/avp-design-considerations.html) [Retrieving external data for a PDP in Amazon Verified Permissions](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/external-data-avp.html) | May 28, 2024 | | [Clarified information](#doc-history) | Clarified the [distributed PDP with PEPs on APIs](https://docs.aws.amazon.com/prescriptive-guidance/latest/saas-multitenant-api-access-authorization/distributed-pdp.html) design model. | January 10, 2024 | | [Added brief information about new AWS service](#doc-history) | Added information about [Amazon Verified Permissions](https://aws.amazon.com/verified-permissions/), which provides the same functionality and benefits as OPA. | May 22, 2023 | | [—](#doc-history) | Initial publication | August 17, 2021 |