What is Causing the com.apple.commerce.client error 500?

We investigated this particular issue by looking at various user reports and the repair strategies that were commonly used to troubleshoot and resolve the issue by users finding themselves in a similar situation. Based on our investigations, there are several different scenarios that are known to trigger this particular error message: If you’re looking for a solution to resolve this exact error message that is keeping you from using App Store in macOS Mojave, then this article will provide you with a list of quality troubleshooting steps. Down below, you’ll discover a collection of methods that have been confirmed to work by at least one user that was affected by the same issue. Follow the methods in the order they are presented since they are ordered by efficiency and severity. One of the methods below is bound to fix the problem, regardless of the culprit that is triggering it.

Method 1: Resetting your iCloud Account on macOS

Your iCloud account can be connected to multiple devices, which can sometimes create a problem for one of the devices. For macOS, this problem can cause the App Store not letting you sign in or download any applications. The simple sign out and sign in again method can help you resolve this issue.

Method 2: Changing the Keychain Access Settings on macOS

Keychain Access stores passwords and information about the account. It also provides you direct access to modify the trust level of certificates. Sometimes a certificate bug can prevent you from logging in to your App Store or downloading applications. You need to change the trust level of “DigiCert High Assurance EV Root CA” certificate to never trust and restart the computer. Then change it back to the use system defaults and it will fix the certificate bug.

Method 3: Update the Payment Details on Your Phone

Sometimes your Apple ID information can be the issue causing the problem for logging in to account or downloading applications from App Store. This error can also appear when purchasing an application from the App Store. You can use another device to update your details (Payment details) and after that sign in from macOS.

Method 4: Changing App Store Settings through Terminal

In this method, we will be using the default command to modify the settings for App Store which is stored in .plist files. Every application has few settings that are not available in App’s preferences and can be accessed through the defaults command. Important: Make sure you log out of the App store and close it before running this command through Terminal.

Method 5: Empty App Store’s Temporary Download Cache Folder

Most of the time applications stop working because of the temporary data becoming corrupt. An easy method to fix this would be by removing the temporary data. Temporary data is just used to speed up the tasks for users by saving the information related to the user. It will be created again after using the application.

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