https://www.facebook.com/marketplace
here's the marketplace ready to be used with messenger! actually messenger is used to contact goods' seller by buyer, but through the solidar bot is ready to make transactions!!!
That's fantastic news! I haven't had this one in sight at all! That's so easy, the merchant can set a price in Solidar, you can contact them in messenger, and buy the product with the messenger. Easy as breathing ;-).