I don't want to trigger anyone, so I will simply say that we had a crisis in our relationship after the discovery of spending sprees, and it resulted in what follows.
We moved all money into accounts under only my control. My wife agreed very reluctantly to give up all plastics, and to do shopping using cash that I provided. Beyond that she had a certain amount of money that she could do absolutely anything with and not have to feel guilty.
It was very difficult, she felt like she was being treated like a child and like she could not be trusted. It took her a long time to realize that it was too her benefit as well.
Eventually she learned to control her impulses and re-earned my trust, though her control was never tested by a major manic or hypomanic episode. She got her debit card back with access to some funds, but the majority of the money was still kept separate.