pay (someone) back in kind

Translations
отплатить (кому-то) той же монетой
After he helped me, I wanted to pay him back in kind.
После того как он мне помог, я хотел отплатить ему той же монетой.
Definitions
To respond to someone’s actions toward you with similar actions, especially to retaliate or return a favor in the same manner as it was received.