# Upgrading from a CRM with Amazon S3 integration to the Partner Central API
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**Note**  
The topics in this section assume you've completed the prerequisites for an AWS Partner Central integration, an AWS Marketplace integration, or both. For more information, refer to [Integration prerequisites](crm-integration-setting-up.md) and [Getting started](crm-integration-getting-started.md) earlier in this guide.

The steps in the following sections explain how to upgrade from an earlier CRM with Amazon S3 integration to the AWS Partner Central API. Upgrading removes the need for several ACE requirements, such as the need for an integration user, and the need to set up synchronization schedules.

**Topics**
+ [Upgrade features](api-upgrade-features.md)
+ [Set up named credentials](set-up-api-credentials.md)
+ [Add the Approval Status button to the Opportunity Lightning Record page](add-approval-status-button.md)
+ [Add the remaining buttons](add-remaining-buttons.md)
+ [Refresh the Solution Offerings tab](refresh-the-solutions-from-the-solution-offerings-tab.md)