Custom key is a profile attribute and it has to match a Product SKU . So basically it's "custom Entity ID" based on a profile. Like if a company had their own definition of favorite product Or if they want to recommend products to me online based on a product I purchased in brick and mortar.
Hi. I'm not sure I understand you example completely. Can you elaborate on how I can begin to promote product purchased in store on our website to that exact customers? Feel free to contact me directly.
The location itself couldnt be a key. A key can only be an entity ID or a category. I believe you are using Target Premium Recommendations and Geography based recommendations have not yet been added to Target Premium yet.
Can you tell me if it is possible to have geo specific product recommendations at all. Such that recommendation change on the basis of visitor location as detected by target. Location based targeting works very well for other activities but it seems that there is no way to do this in recommendations.