The meaning of this term remains obscure to me. Intuitively I choose between
a registration fee;
a standard payment;
a fixed tax payment
and those meanings given by the linguee.it:
a registration charge;
a registration duty.
Sometimes the term seems having a broad meaning, while at the other moments it is likely being specific.
So, is it a variable amount or is it a fixed payment? Is it applied under different cirumstances or under the same ones?
Many thanks for your help in advance.