App resources
Developers have traditionally used PHP to create in-process extensions to add features, functionality, services, and integrations to Adobe Commerce. By creating apps with out-of-process extensibility, as opposed to extensions, you can avoid compatibility issues.
The following resources provide a starting point for new adopters to familiarize themselves with apps:
Commerce resources
App Builder resources
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Getting Started with App Builder/Developer Console
Marketplace credentials
Before you can install an extension purchased from Commerce Marketplace, sign in to your Commerce account and verify that you have an active access key. You can sign in to your Commerce account from the header of Marketplace or Magento.com.
Your access key is a set of public and private keys that is used to synchronize your Commerce installation with your Commerce account and verify your credentials. After your account is synchronized, you must enter your private key each time you install an extension or module from Commerce Marketplace or upgrade your Commerce installation.
You can create multiple access keys for different purposes and enable or disable them as needed. However, you must use the same access key that was used to install the Commerce software. For example, you cannot use a Magento Open Source access key to update or upgrade Adobe Commerce, or conversely. You also cannot use an access key that belongs to another user or one that is from a shared account.