OEM
Online Exchange Marketplace

As Screens in
Ghurfs (cabins)
Walls
Special markets (Ghanis)
Or
As AR code in
Skies
or Footpaths



Plate of leftover meal,1/2 cup sugar,1 cup oil etc would be available in exchange for any service.
There would be services too,as simple as making a fb business page or YouTube channel.
There would be pictures of things, particularly for those who can not read or use Android.There would be voice assistant too,for the same purpose,in kiosks at ghurfs.OEM, however,is for every person,from every class of society whereby the 2 individuals could exchange things (easy barter app/website)
Main feature would be the direct dialing of WhatsApp number of the product owner,just by clicking on the picture of product.
The product owner and the exchanger would talk,and decide the meeting place where the person would pay him the unit cards or typically the service/product of similar value,and get the thing or service from the owner.
Area filter on the website would be necessary.