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# Apply coupon

> Add a coupon to a subscription. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/chargebee/apply_coupon

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)

Add a coupon to a subscription.

Chargebee MCP tools: https://cotlet.dev/docs/mcp/chargebee.md

MCP tool: `chargebee_write → apply_coupon`

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

Adds the coupon to the subscription's existing coupons and returns the full list. Chargebee lists only coupons that apply to the subscription's plan, and by default allows one fixed and one percentage coupon per subscription. A coupon can be added at any point in the billing cycle. It changes what the customer pays on later invoices, 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. |
| `coupon` | string | yes | Coupon ID or coupon code, for example SAVE20. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "chargebee_write",
    "arguments": {
      "operation": "apply_coupon",
      "arguments": {
        "subscription_id": "subscription_8c41d2",
        "coupon": "coupon"
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "subscription_id": "sub_9s2kQw",
    "coupons": [
      {
        "coupon_id": "SAVE20"
      }
    ]
  },
  "isError": false
}
```

Previous: [Create credit note](https://cotlet.dev/docs/mcp/chargebee/create_credit_note.md)
Next: [Record invoice payment](https://cotlet.dev/docs/mcp/chargebee/record_invoice_payment.md)

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## 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.