the.com/payback
The universe's way of mailing your karma back, postage due, with interest.
means Either a financial return on what you invested, or retaliation for a wrong you committed.
from American business slang from the early 1900s, literally paying money back; the revenge sense crept in by mid-century when getting even started feeling like settling a debt.
Twin meaningsProfits and revenge share one word, tellingly.
Payback periodFinance term for when an investment recoups itself.
Pop cultureMel Gibson made it a 1999 movie title.