Payment driver for Payzum (non-custodial crypto/stablecoin gateway) — PR welcome?

Hi,

Would you accept a PR adding a payment driver for Payzum, a non-custodial crypto/stablecoin gateway (USDC, USDT and more, multi-chain)? Funds settle directly to the merchant's own wallet, and buyers pay on a hosted checkout page — the driver is a redirect flow plus a signature-verified webhook (HMAC-SHA-512), so no card fields and no extra PCI surface.

I'd model it closely on the existing BTCPay driver (BTCPayPaymentDriver + the PaymentDrivers/BTCPay classes, migration and blade views), which matches Payzum's flow almost exactly: invoice creation → redirect → webhook confirmation, with the same paid/expired/processing status shape. The HTTP and signature layer would come from our official PHP SDK (payzum/payzum-php, MIT, zero runtime dependencies, PHP ≥ 8.1).

If you'd rather not take new gateway drivers in-core right now, no problem — just say so and I'll leave it. Otherwise I'll open the PR with the driver, migration and tests.

Disclosure: I work on Payzum and would maintain the driver long-term.