# Offer methods: trial, withdraw

URL: /code/sdk/offer/verbs-trial · Id: `page:code/sdk/offer/verbs-trial`

> The Offer Verbs trial, withdraw as typed SDK methods, with inputs, result, refusals and an example.

Reference for [Offer](/business/nouns/offer), one group of [Offer methods](/code/sdk/offer).

### Offer.trial
Trial starts a Customer on an Offer free for a set number of days, with or without a card, converting or ending by its terms. [Verb page](/business/nouns/offer/trial?interface=sdk).

```ts
interface OfferVerbs {
  trial(input: OfferTrialInput, options?: SB.CallOptions): SB.Call<OfferTrialOutput>
}
```

Emits [`Offer.trialed`](/business/events/Offer.trialed).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `offer` | [Offer](/business/nouns/offer) | Yes | The Offer to try. |
| `customer` | [Customer](/business/nouns/customer) | Yes | The Customer who tries it. |
| `days` | `integer` | Yes | How long the trial runs. Never randomized. |
| `card` | `boolean` | No | True to take a card up front and charge it when the trial ends. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `subscription` | [Subscription](/business/nouns/subscription) | Yes | The Subscription, free until the trial ends. |
| `offer` | [Offer](/business/nouns/offer) | Yes | The Offer the trial is on. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| 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. | None. |

**Example**

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

const { subscription, offer } = await $.Offer.trial({ offer: 'offer_2hzYe1ERo0', customer: 'cus_K1BROJhqzZ', days: 1 })
```

### Offer.withdraw
Withdraw closes a published Offer to new Customers and leaves every existing Order and Subscription in force. [Verb page](/business/nouns/offer/withdraw?interface=sdk).

```ts
interface OfferVerbs {
  withdraw(input: OfferWithdrawInput, options?: SB.CallOptions): SB.Call<Offer>
}
```

Emits [`Offer.withdrawn`](/business/events/Offer.withdrawn).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `offer` | [Offer](/business/nouns/offer) | Yes | The Offer to withdraw. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `offer` | [Offer](/business/nouns/offer) | Yes | The Offer, closed to new acceptance. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| 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. | None. |
| The record is not in a state that allows this Verb, so the call is refused. | [`refused`](/code/api/errors/refused) | Read the record, run the Verb that moves it to an allowed state, then retry. | None. |

**Example**

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

const offer = await $.Offer.withdraw({ offer: 'offer_2hzYe1ERo0' })
```