It is unclear what "ga platform" you are referring to as there could be different meanings for it. However, if you are referring to the General Agreement on Tariffs and Trade (GATT) platform, it was an international trade organization involving numerous countries. The initial GATT agreement in 1947 involved 23 countries, including the United States, Canada, the United Kingdom, France, Australia, and several others. Over time, the membership expanded with more countries joining, and eventually, the GATT was replaced by the World Trade Organization (WTO) in 1995. The WTO now has 164 member countries.
