Invoices and refunds

Invoices where the rules are the database's job: refunds only against paid invoices, never more than was paid.

Who it's for

Freelancers and small businesses who invoice customers and refund them, and who want the money rules guaranteed instead of re-implemented in every screen.

What you get

Customers, invoices and line items with totals and balances computed for you.

Refund requests that must reference a paid invoice, cannot exceed what remains, and are approved only by the workspace owner.

An outbox event for every approved refund, ready for an email worker.

The same rules written in GenAI-Logic's declarative form, as a starting point for a rules-engine backend.

Works well with

subject-individual, subject-business, loops-email.

Under the hood

Triggers write every derived value; clients cannot. Role-switched SQL tests try to break each rule.