Same as @Luk_nuts , every fix expenses and recurrent spendings (rent, energy, home insurance) are wire automatically from my account.
we share the cost with a participation based on revenue. 65% for me and 35% for her.
My wife wire me a contribution monthly. We actualised it once or twice by year.
For the unpredictable spendings (grocery, restaurants …), we use our credit card and split 50/50.