Login to your account and generate App ID/Cert ID (Production Key Set).
Make sure OAuth is enabled for your keys otherwise enable it.
Deletion/Closure Notifications
Content Egg plugin does not store any personal data of eBay's users. If this is the case, the developer may apply for exemption from receiving eBay marketplace account deletion/closure notifications. For more information, see the Opting Out of eBay Marketplace Account Deletion/Closure Notifications.