schema.org - Which property is used to indicate that a review was posted on Amazon/Google Play/etc.? -

i'm adding rich snippets ecommerce site. have reviews multiple sources, not sure property best. i'm stuck between provider , sourceorganization.

maybe use publisher property? definition is:

the publisher of creative work.

the property sourceorganization says "on behalf creator working"; in way, writing review on organization’s site "working" them, i’m not sure if that’s intended that.

i don’t understand definition provider property in context, though. doesn’t "service" mean (it makes sense if used on service type, on review?). , why refering "producer" (in "the goods producer"), although there’s separate producer property defined? i’m not sure using property.