Delete accounts with a value if 0 in a specific scenario

The API call is BRApi.Finance.MemberAdmin.RemoveMember, you will find it in the api tree. If you don't know how to look for intersection values or how to create the necessary PK objects to pass, I'd suggest checking out the Financial Calculations Handbook book, or coming to a Rules class.

I might sound patronizing, but I would also suggest you implement this as a Custom Calculate function, and take good backups before you start executing it. Having it as part of a regular Calculate would be very risky. What you are trying to achieve has the potential to be very destructive, I really would not recommend it.