I need help making a WA that triggers if the Healer of a party or raid is in my guild.

[modern coral]

I am unsure where to start.

I know the event is PARTY_MEMBERS_CHANGED
but I am unsure how to program the function I know the API I Need is guildName, guildRankName, guildRankIndex = GetGuildInfo(unit)

[muted monolith]

GROUP_ROSTER_UPDATE would be the event

function()
  local myGuild = GetGuildInfo("player")
  for unit in WA_IterateGroupMembers() do
    if (not UnitIsUnit("player", unit))
    and UnitGroupRolesAssigned(unit) == "HEALER"
    and GetGuildInfo(unit) == myGuild then
      return true
    end
  end
end