# POST /referrals/:referral_id/commissions

**Resource:** [Referrals](./referrals.md)  
**MCP tool:** `add_referral_commission`  
**Scopes:** `referrals:write`  
**Write operation:** yes

Add a commission instalment to a referral. amount is required; status defaults to scheduled. The cached commission summary (paid-to-date / pending / next-payment) on the referral updates automatically.

## Parameters

| Name | In | Type | Required | Description |
|------|----|------|----------|-------------|
| `referral_id` | path | string | yes |  |
| `amount` | body | number | yes |  |
| `status` | body | string | no | scheduled \| paid \| cancelled. Defaults to scheduled. |
| `due_date` | body | string | no | ISO date (YYYY-MM-DD) the instalment is expected. |
| `paid_date` | body | string | no | ISO date (YYYY-MM-DD) the instalment was paid. |
| `notes` | body | string | no |  |

## Request example

```bash
curl -X POST   "https://api.trustpager.com/functions/v1/api/v1/referrals/:referral_id/commissions"   -H "Authorization: Bearer YOUR_API_KEY"   -H "Content-Type: application/json"   -d '{"amount":"...","status":"...","due_date":"..."}'
```

---
Base URL: `https://api.trustpager.com/functions/v1/api/v1` — Auth: `Authorization: Bearer YOUR_API_KEY`