I got seeds of a "Kadsura sp" from Thailand. I was a little apprehensive since the seeds were in pretty foil packs with pictures on them, like they were being sold in stores. I soaked the kadsuras in water until they sank (don't recall how long that took) and put them in a baggy with damp sphagnum. The first of the seeds starting germinating within a couple of weeks. They have been sporadically sprouting now for about 2 months, with almost all germinated now. So, unless it is a temperate species in question, I don't think a chill is required. It is interesting to note that I have not seen any above ground growth of those seeds I have planted. Hopefully, they are growing roots first & have not just decided to die once they were put in soil.
By the way, I got zero germination (seeds rotting) on the other, recalcitrant seeds I got from this guy.
John