# renew

URL: /business/nouns/subscription/renew · Id: `verb:Subscription.renew` · Call: `await $.Subscription.renew({ … })` (SDK) or the `do` tool at `https://api.sb/mcp`. Inputs says what to pass, Outputs what returns, When it waits who approves.

> Renew starts a Subscription’s next period and bills it at the Offer Version the Customer accepted.

Renew starts a [Subscription](/business/nouns/subscription)’s next period and bills it at the [Offer](/business/nouns/offer) [Version](/business/nouns/version) the [Customer](/business/nouns/customer) accepted.

## Inputs
| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `subscription` | [Subscription](/business/nouns/subscription) | Yes | The Subscription to renew. |

## Outputs
| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `invoice` | [Invoice](/business/nouns/invoice) | Yes | The Invoice for the new period. |
| `subscription` | [Subscription](/business/nouns/subscription) | Yes | The Subscription in its new period. |

## Effects
- Emits [`Subscription.renewed`](/business/events/Subscription.renewed).
- Performed by the [Billing Specialist](/agents/finance/billing-specialist).
- Two-way: it runs at once, in the `try`, `send` and `do` modes.
- Runs on the period boundary with no caller.
- Suspends Entitlements when payment fails after every retry.

## Refuses when
| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The operation is part of an Offer the caller has not accepted or paid for. | [`payment-required`](/code/api/errors/payment-required) | Accept the Offer named in the response, then retry the call. | [Offer.accept](/business/nouns/offer/accept) |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | [Subscription.renew](/business/nouns/subscription/renew) |

## When it waits
| Gate | Default |
| --- | --- |
| Decision class | Low: two-way, nothing at stake |
| [Delay window](/systems/trust-and-governance/controls/one-way-windows) | None: it runs once review passes. |
| Limit | The call [Limit](/business/nouns/limit) of the [Permission](/business/nouns/permission) it runs under. |
| Over the Limit | It waits `pending` for an [Approval](/business/nouns/approval) from the [Founder](/agents/founding/founder). Approved, it runs; refused, it ends `refused` with [`limit-exceeded`](/code/api/errors/limit-exceeded); unanswered by its deadline, it ends `canceled`. |

## Example

**Ask**

```text
Renew the latest subscription.
```

**API**

```bash
curl -X POST https://api.sb/tutorloop.com/subscriptions/subscription_1/renew \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/tutorloop.com",
  "invoice": {
    "$id": "https://api.sb/tutorloop.com/invoices/invoice_1",
    "$type": "Invoice",
    "total": {
      "amount": 60,
      "currency": "USD"
    },
    "due": "2026-10-22"
  },
  "subscription": {
    "$id": "https://api.sb/tutorloop.com/subscriptions/subscription_1",
    "$type": "Subscription",
    "status": "active"
  },
  "action": {
    "$id": "https://api.sb/tutorloop.com/actions/action_1",
    "operation": "Subscription.renew",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/tutorloop.com/actions/action_1"
  }
}
```

**SDK**

```ts
import { $ } from 'startup-builder'

const { invoice, subscription } = await $.Subscription.renew({ subscription: 'subscription_1' })
```

**CLI**

```bash
npx startup-builder do Subscription.renew --json '{"subscription":"subscription_1"}'
```

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Subscription.renew({ subscription: 'subscription_1' })"
  }
}
```