How to share Netflix costs?

I'd like to share with my girlfriend Netflix, but just nowhere is how to share the price! Is that possible?

One person has to do that via his payment methods and the other one will give half again.

I always do that

Yes, but not officially.

one of you must complete the contract and the other must give half to the other. Example: you buy the subscription for 8 euro per month then the other one has to give 4 euro each month

Okee, thanks

With pleasure

Officially, account sharing is not allowed, so there will be no official help.