Accept crypto and stablecoin payments (USDC, USDT and more, multi-chain) for your
events through Payzum — non-custodial: funds settle directly to your own wallet,
Payzum never takes custody.

How it works:

• The attendee picks the crypto payment method at checkout and is redirected to a
  hosted checkout page, where they choose the asset and network and send the
  payment. No wallet data ever touches your pretix server.
• Crypto confirmation is asynchronous, so the order is marked as paid from
  Payzum's signed server-to-server notification, never from the browser return.
  An attendee who comes back while the payment is still confirming sees the
  regular pending-payment page, which updates as soon as the payment settles.
• Every notification is verified with HMAC-SHA-512 over the raw request bytes
  (with a replay window) before a single field of it is read, and the invoice
  amount and currency are re-checked against the payment before it is confirmed.
  Redelivered notifications are a no-op, so an order is never marked paid twice.

Setup takes two settings: an API key and a webhook secret, both from the Payzum
merchant dashboard. Prices stay denominated in your event currency; you can let
buyers pick any supported asset or pin one (e.g. USDC on Polygon).

The plugin is MIT-licensed, modeled on pretix-mollie, and its test suite runs
against pretix itself and covers the signed-webhook flow end to end.