> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstpromoter.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Integration

> Track referrals server-side with the FirstPromoter Tracking API

`Difficulty: Intermediate`<br />
`Developer Required: Yes`

With the FirstPromoter Tracking API you can track signups, sales, refunds, and cancellations directly from your backend — no JavaScript required.

**Available endpoints:**

| Endpoint                          | Purpose                                 |
| --------------------------------- | --------------------------------------- |
| `POST /api/v1/track/signup`       | Track a lead sign-up                    |
| `POST /api/v1/track/sale`         | Track a sale and generate a commission  |
| `POST /api/v1/track/refund`       | Track a refund and reverse a commission |
| `POST /api/v1/track/cancellation` | Track a subscription cancellation       |

See the [Tracking API reference](/api-reference-v1/tracking-api/signup) for full parameter documentation including deduplication via `event_id`, recurring commission scheduling, and custom fields.

Click [here](https://login.firstpromoter.com?redirect=%2Finstructions%2Fapi) to view the in-app setup guide.