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A billing record showing what a customer owes or paid.
Invoices are accounting and customer-support artifacts. They tie products, taxes, discounts, payment status, and receipts together.
Plainly
Think of Invoice as the checklist that keeps the app open for real people. A billing record showing what a customer owes or paid.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.