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---
name: deep-reference
description: Answers questions about the billing schema. Use when a question names a billing table, or when the user asks how invoices relate to subscriptions.
---
# Deep reference
1. Find the table in [the schema notes](references/billing/tables/invoices.md).
2. Answer from that file only. Stop when the answer names a column.
## When to open which reference
[invoices.md](references/billing/tables/invoices.md) holds the column list.
