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Custom policies deal with products that may include additional terms, such as government trade-in policies (think car battery cores that are taken back when a new car battery is purchased).
I have not found this policy on the US site. Are you creating a listing on another site, or possibly on eBay Motors?
Here is an eBay help page in France that describes a "custom policy".
https://www.ebay.fr/help/selling/custom-policies/custom-policies?id=5311
and the English translation is here:
When a policy ID is expected, that means one has been set up on your account settings and that you will insert the ID from your own account settings. This particular "CustomPolicies" column is supported by only a limited number of sites, so if you are listing on another site, that may be why it appears as an option.
Below is eBay's API info for those fields:
| Item.CustomPolicies | CustomPoliciesType | Optional | This container is used to apply one or more custom policies to the listing by specifying custom policy IDs. Custom policies include Product Compliance and Take-Back Policies. For more information, see the Custom Policies page for your site (for example, https://www.ebay.fr/help/selling/custom-policies/custom-policies?id=5311). This container is supported by a limited number of sites and specific categories. Use the getExtendedProducerResponsibilityPolicies method of the Sell Metadata API to retrieve valid categories for a site. To create and manage custom policies, use the custom_policy resource of the Account API. |
| Item.CustomPolicies .ProductCompliancePolicyID | long | Optional, repeatable: [0..5] | This field is used if the seller wants to apply one or more product compliance policies to the listing. A separate ProductCompliancePolicyID field is required for each policy to be applied, and the seller specifies the identifier of each policy in this field. |
