Play online with Playstation Now?

I "accidentally" got a PS Now subscription for 12 months for 41.99 euro (reduced instead of 59.99 euro) from Amazon. And only then saw that it's PS Now instead of PS Plus. I'm really only interested in online games (FIFA, etc…). Find no helping internet entries but only that PS Now is supposedly better than PS Plus. But can I do that with this PS Now voucher or was it a go in the toilet? And if so, can you accidentally cancel the unused voucher at Amazon?

You can play online with it. You can only play the games offered for free

I would try to contact Amazon and ask if you can exchange the voucher.

Because PS Plus and PS Now are two completely different things. You need PS Plus for online gaming… And PS Now offers you the opportunity to access countless games, which you can play as long as your subscription is active.

Unfortunately, you can't gamble online with a PS Now subscription.

It therefore matters what one would like to do in order to find one or the other subscription "better".