When setting product dictionary keys for SKStoreProductViewController the Apple API Documentation mentions a new for iOS 8.3 token called SKStoreProductParameterProviderToken that can help with affiliate promotions. There is no further description on where to find the value of this token, and the suggestion in the above link to review the Viewing App Analytics link had no mention of this new token at all.
Does anyone know where you find this? I don't see it my iTunes Connect or the Developer Portal.
Finally burned an incident and just asked Apple directly to clarify.
For others who may hit this, the API documentation at the time of this post is missing some important details on this new SKStoreProductParameterProviderToken.
This token value is supplied by you, the developer, to assist in tracking your iTunes Connect App Analytics campaign. It is an NSString instance which is 40 bytes in length and only available in iOS 8.3 and above. No more, no less.