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

# Connect payment providers

> Connect your payment provider to link revenue to your marketing campaigns

Connect your payment provider to see which marketing channels drive revenue, not just traffic.

## Supported providers

PostMetric supports the following payment providers:

* **Stripe** - Checkout API, PaymentIntent API, Payment Links
* **LemonSqueezy** - Checkout API, Payment Links
* **Custom API** - Record payments via our API

## How it works

When a payment is completed, PostMetric links it to the visitor who made the purchase. This allows you to:

* See which marketing channels drive revenue
* Calculate ROI for your campaigns
* Track conversion rates by source
* Identify your most valuable traffic sources

## Setup methods

### Method 1: Webhooks (Recommended)

Webhooks automatically send payment data to PostMetric when a payment is completed.

<CardGroup cols={2}>
  <Card title="Stripe webhooks" icon="stripe" href="/revenue-attribution/stripe">
    Set up Stripe webhooks
  </Card>

  <Card title="LemonSqueezy webhooks" icon="lemon" href="/revenue-attribution/lemonsqueezy">
    Set up LemonSqueezy webhooks
  </Card>
</CardGroup>

### Method 2: API

Record payments manually using our API:

```bash theme={null}
curl -X POST https://your-domain.com/api/v1/payment \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "provider": "stripe",
    "providerPaymentId": "pi_1234567890",
    "amount": 99.99,
    "currency": "USD",
    "visitorId": "visitor_123",
    "sessionId": "session_456",
    "customerEmail": "customer@example.com"
  }'
```

See our [Payment API documentation](/api-reference/payment) for more details.

## Linking payments to visitors

PostMetric uses three methods to link payments to visitors, in order of preference:

1. **Metadata method** (most reliable) - Include `visitorId` or `sessionId` in your payment metadata
2. **Email matching** - Match customer email to identified users
3. **Timestamp correlation** - Link payments to recent sessions (fallback)

<Note>
  For best results, use the metadata method by including visitor/session IDs in
  your payment metadata.
</Note>

## View revenue data

Once payments are linked, you can view revenue data in your dashboard:

* Revenue over time
* Revenue by source/channel
* Conversion rates
* Average order value by source

## Next steps

<CardGroup cols={2}>
  <Card title="Stripe integration" icon="stripe" href="/revenue-attribution/stripe">
    Detailed Stripe setup guide
  </Card>

  <Card title="LemonSqueezy integration" icon="lemon" href="/revenue-attribution/lemonsqueezy">
    Detailed LemonSqueezy setup guide
  </Card>
</CardGroup>