Safwan bin umayyah was given payments despite being wealthy, this ruling was abrogated (to give to those to soften their hearts).
Umar farooqs time, the sahabah agreed that this is now abrogated.
Those who collect the zakat can take their wages from the zakat itself in proportion to how much they worked.
The warrior who is left behind from the army is also eligible.
Those who are students that have to travel to seek knowledge, they are also eligible for zakat.
You cannot give your obligatory zakat to a dhimmi: a kafir that lives in Muslim lands.
Obligatory zakat is only Muslims.