To upload the new Security Key File, follow the steps below:
1. Navigate to Setup > Accounting > Payment Processing Profiles
2. Click on the Edit button on your CyberSource account
3. Go to the Security Key File field and click on the Browse button
4. Look for the Security File you downloaded and select it
5. Save the page.
For the steps on how you can download the Security Key File from your CyberSource account before uploading to NetSuite, follow the steps on the Answer ID 12532.
If you are still getting an error after uploading your new Security File in NetSuite, kindly follow the instruction on Answer ID 35349.