Where does “paga” come from?

paga (Italian) comes from Italian pagare, from Italian pacare, from Latin pācāre, from Latin pāx, from Proto-Italic pāks, from Proto-Indo-European péh₂ḱ-s, from Proto-Indo-European peh₂ḱ- — to join, to attach; agreement, settlement.

paga (Italian): pay; wages; reward, recompense