Silver codes are the double digit codes from 10 to 99.
Each accommodation in the world has one World Hotel Code which has been created for them free of charge.
Free codes are those above the number 1000, which will be joined with WCC to create a WHC, which is exclusively and permanently registered for each hotel.
Any high level hotel can purchase an available silver code, which will replace the previous free code after payment. The accommodation will then become a member of Silver Code group, and will be able to introduce themselves to the world, using their silver code.