I think invoices should be allowed to fail before they are sent

I think a lot of people only let invoices fail in the most expensive place possible:

after they are sent,

after the due date passes,

after follow-up starts,

after the cash is already late.

That feels normal because invoicing is usually treated like a send-first, diagnose-later process.

But the more I work on Billzy, the more I think that is backwards.

I think invoices should be allowed to fail before they are sent.

Not fail in a dramatic way.

Fail like a useful system check.

For example:

- approver unknown

- AP path unclear

- PO or vendor setup missing

- terms not aligned with the client's actual payment behavior

- no clear payment route beyond the main contact

If those things are weak, I think the invoice should be treated as not ready.

Because once you send it anyway, you are often just moving a hidden problem into a later, more expensive part of the workflow.

And then when the invoice goes late, it looks like a reminder problem.

But sometimes the reminder is not the real issue at all.

The invoice was fragile before it even left your side.

That is why I keep thinking invoicing needs something closer to a preflight check.

Not just:

"was the invoice created?"

More like:

"is the payment path strong enough that sending this is actually responsible?"

That feels much more useful to me than getting very good at chasing invoices that should have failed a basic readiness check.

This has become a product lens for me with Billzy too.

I do not just want overdue recovery logic.

I want the system to surface the weak spots early enough that some bad invoices never get sent in a fragile state at all.

Because the cheapest late-payment fix is often the one that happens before the invoice exists as a problem.

I think this applies outside invoicing too.

A lot of messy operations are allowed to proceed because nothing forces them to fail early.

And when systems stop weak work early, they usually save a lot of cleanup later.

Curious how other founders and freelancers think about this:

If you could block invoice sending on one missing condition, what would you choose first: approver name, AP contact, PO/vendor setup, or payment terms fit?