If you still want to work in this dealer, you have to pay back the money, but you don't have to pay back if you change dealers.

Under normal circumstances, the foreign exchange margin account will explode when the available margin is zero.

However, there are also a few foreign exchange dealers who have different rules for opening positions. They may not open the position when the available margin is zero, but they will lose a certain percentage of the occupied margin before opening the position.