Yes, PAYLOADS is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, Y 4, L 1, O 1, A 1, D 2, S 1.

Is it a valid word?

PAYLOADS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents
goods carried by a large vehicle