Call if duty modern warfare remastered Multiplayer, how to buy it?!

So a mate of mine bought a PS4.

We used to play COD Modern Warfare multiplayer on the 360 back in the day.

I got Modern Warfare multiplayer included with Infinite Warfare when I bought it.

I can’t figure out how you buy it separately though.

All he wants is to go online and play some P v P. Zero interest in the campaign. Just wants to sho

Any ideas? Maybe I’m missing it but I just can’t see it anywhere.

Edit... found it on the French Amazon site but surely you can get it digitally no?

https://www.amazon.fr/Call-Duty-Modern-Warfare-Remastered/dp/B071KK5718/ref=mp_s_a_1_1?dchild=1&keywords=modern+warfare+remastered&qid=1603972303&sr=8-1