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# Change subscription plan

> Move a subscription to another plan or quantity, now or at renewal. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/chargebee/change_subscription_plan

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Move a subscription to another plan or quantity, now or at renewal.

Chargebee API: https://cotlet.dev/docs/api/chargebee.md

`PATCH https://cotlet.dev/api/v1/chargebee/item-prices/{item_price_id}/subscriptions/{subscription_id}/plan`

Access: write. Confirm: waits for the user's OK before it runs.

Applies the change in Chargebee's Edit Subscription flow and returns the subscription and any invoice the change created. With apply set to immediately and prorate true, Chargebee credits the unused time on the old plan and charges the new plan for the rest of the term, so the invoice total is the difference. With next_renewal, nothing is invoiced until the renewal. Mandatory addons of the old plan stay unless you remove them. The customer sees the new invoice, so by default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `subscription_id` | string | yes | Subscription ID from list_subscriptions. |
| `item_price_id` | string | yes | The plan price to move to, for example growth-USD-monthly. |
| `quantity` | integer | no | Units of the plan. Default: the current quantity. |
| `apply` | enum | no | immediately or next_renewal. Default: immediately. |
| `prorate` | boolean | no | With apply set to immediately: credit unused time and charge the new plan for the rest of the term. Default: your site setting. |
| `replace_items` | boolean | no | true replaces all items with the one you send, false adds it. Default: true. |

## Request

**cURL**

```bash
curl -X PATCH https://cotlet.dev/api/v1/chargebee/item-prices/growth-USD-monthly/subscriptions/sub_4d7mTz/plan \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"quantity":1,"apply":"immediately","prorate":true}'
```

**Python**

```python
result = client.call("chargebee", "change_subscription_plan", {"subscription_id":"sub_4d7mTz","item_price_id":"growth-USD-monthly","quantity":1,"apply":"immediately","prorate":True})
```

**Node.js**

```js
const result = await cotlet.call('chargebee', 'change_subscription_plan', {"subscription_id":"sub_4d7mTz","item_price_id":"growth-USD-monthly","quantity":1,"apply":"immediately","prorate":true});
```

**CLI**

```bash
cotlet call chargebee change_subscription_plan --data '{"subscription_id":"sub_4d7mTz","item_price_id":"growth-USD-monthly","quantity":1,"apply":"immediately","prorate":true}'
```

## Example response

```json
{
  "subscription": {
    "subscription_id": "sub_4d7mTz",
    "status": "active",
    "items": [
      {
        "item_price_id": "growth-USD-monthly",
        "quantity": 1,
        "unit_price": 29900
      }
    ],
    "next_billing_at": "2026-11-01T00:00:00Z"
  },
  "invoice": {
    "invoice_id": "INV-1043",
    "status": "payment_due",
    "line_items": [
      {
        "description": "Growth plan, prorated charge",
        "amount": 14950
      },
      {
        "description": "Starter plan, unused time credit",
        "amount": -4950
      }
    ],
    "total": 10000,
    "currency_code": "USD"
  }
}
```

Previous: [List credit notes](https://cotlet.dev/docs/api/chargebee/list_credit_notes.md)
Next: [Cancel subscription](https://cotlet.dev/docs/api/chargebee/cancel_subscription.md)

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Cotlet is an independent service. It is not affiliated with, endorsed by or sponsored by any of the products listed on this site. Product names are trademarks of their respective owners.

## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.