Please log into your Apple Search Ads Account.
Click on the arrow next to your accounts name, and click on Settings from the drop down box.
On the Account Settings page, please go to the API tab.
You can see all of your previously created API certificates listed.
To create a new certificate, please click on the Create API Certificate button.
Enter a name for the new certificate.
Select Account Admin.
PS: Please note that it might take some time for the new certificate to appear on the page. After some time refresh the page and your new certificate will be visible.
To download the new certificate, please select it from the list, click on Actions and select Download certificate.
And there you have it!
Please check our post on How can I integrate my API Certificate to SearchAds.com to start your integration!