Types that use ExternalProductCodeType:
| Value | Description | Which calls use this value * |
| CustomCode | Reserved for internal or future use | (not used by any call) |
| EAN | ExternalProductID.Value contains an EAN value. Required when you pass an EAN as the external product ID. | (not used by any call) |
| ISBN | ExternalProductID.Value contains an ISBN value. Required when you pass an ISBN as the external product ID. (This value is also applicable to Half.com listings.) | (not used by any call) |
| Keywords | ExternalProductID.Value contains a set of keywords that uniquely identify the product. Only applicable when listing event ticket. See the eBay Web Services guide for information about valid ticket keywords for an external product ID. Required when you pass a set of keywords as the external product ID. | (not used by any call) |
| MPN | Reserved for future use. | (not used by any call) |
| ProductID | ExternalProductID.Value contains an eBay catalog product ID. Required when you pass an eBay product ID as the external product ID. | (not used by any call) |
| UPC | ExternalProductID.Value contains a UPC value. Required when you pass a UPC as the external product ID. (This value is also applicable to Half.com listings.) | (not used by any call) |
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