> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hyperline.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Answer a billing question with AI

> AI skill that answers Hyperline billing questions by combining product documentation with read-only checks against your live account data.

Use this skill when an AI assistant needs to answer a question about a billing workflow, a customer account state, or how to use Hyperline.

## Skill

```md theme={null}
---
name: answer-billing-question
description: Answer a Hyperline billing question using documentation and read-only data checks. Use when an agent needs to explain subscriptions, invoices, payments, quotes, usage, credits, wallets, analytics, custom properties, or API behavior.
---

# Answer Billing Question

Start with documentation. Use account data only when the answer depends on the customer's current state.

## Inputs

Collect:

- The user's question.
- Environment: production or sandbox if account data is needed.
- Relevant entity IDs, names, or URLs if the question is about a specific customer, subscription, invoice, quote, or product.

## Workflow

1. Classify the domain: subscriptions, invoices, payments, quotes, usage, credits, wallets, analytics, custom properties, integrations, or API.
2. Read the most relevant Hyperline documentation or API reference.
3. If the question depends on live data, run read-only MCP, CLI, or API calls to inspect the relevant records.
4. Answer directly.
5. Include links to the most relevant docs when they help the user act.
6. Separate confirmed facts from assumptions.

## Output

Return:

- Short answer first.
- Then the explanation or steps.
- Then docs links or checked records.
- Then any caveats.

## Safety

- Do not change account data while answering a question unless the user explicitly asks and confirms the exact action.
- Do not expose internal implementation details.
- Do not invent IDs, statuses, or product names.
- If data is ambiguous, say what is ambiguous and ask for the missing identifier.
```

## Related documentation

<CardGroup cols={2}>
  <Card title="Hyperline docs MCP" icon="robot" href="/api-reference/docs/ai/overview">
    Use Hyperline's AI-friendly documentation entry points.
  </Card>

  <Card title="API getting started" icon="code" href="/api-reference/docs/getting-started">
    Learn the API basics.
  </Card>
</CardGroup>