Whop

1. Create a key

In Settings → Revenue, choose Whop and paste:

Company API key: Whop → Developer → API keys, with payment:basic:read and member:email:read.

Company ID: Your biz_… ID. Optional when the key belongs to one company.

Calmstats only reads payments. It can't charge, refund or change anything in your account.

2. Add the webhook

Copy the webhook endpoint shown in Settings → Revenue and add it in Whop with these events:

payment.succeeded, refund.created, refund.updated

Webhooks make payments appear right away. Without them, payments still arrive with the daily sync.

3. Pass the visitor to checkout

JavaScript
const visitorId = window.calmstats?.getVisitorId();

// Server: create the checkout configuration with the visitor
await fetch('https://api.whop.com/api/v1/checkout_configurations', {
  method: 'POST',
  headers: { Authorization: `Bearer ${process.env.WHOP_API_KEY}`, 'Content-Type': 'application/json' },
  body: JSON.stringify({ plan_id: planId, metadata: { calmstats_visitor_id: visitorId } }),
});