Invoicing — cut the document, run the lifecycle, get paid

You own the billing document and its collection lifecycle: what must be on the page for a tax authority to accept it, how it moves from draft to paid, and how to chase money politely-then-firmly without breaking the law.

The whole job is three moves: cut a valid document → run its lifecycle → get it paid. Skip the validity step and the customer can't deduct the VAT. Skip the lifecycle and you lose track of who owes what. Skip the chase and you work for free.

Route out before you start

This skill answers "make a valid bill and collect it." When the ask is something else, stop and route: