Μισθός reward is strictly wages. Compare Isa 40:10; Isa 62:11. See on 2Pe 2:13.
To give (ἀποδοῦναι)
Lit., to give back or in return for, thus appropriate to μισθός reward. Hence Rev., better, render. See on give an account, Luk 16:2; and see on gave, Act 4:33.