1. Navigate to Settings > Listing Settings > Listing Defaults
2. Click on the eBay logo (if you have multiple eBay storefronts, hover over the icon to see the name you have assigned that storefront)
3. Here you will see various listing defaults for eBay and at the bottom of the page, you will see your different policy ID's. Each policy should be labeled and have a specific ID that is unique to that policy.