The first step is to create your eBay Partner Network account, if you do not already have one.
Once your account is created and you are logged in, click on Campaigns
Fill in the necessary info about your website and then grab your Campaign ID:
Next, you will need to create an App ID. The first step is to create an eBay Developers account.
Create your account and then enter in your application name and click on Create a Keyset:
Then grab you App ID: