OpenReceive
Open-source Bitcoin checkout, paid to your own wallet
...Optionally, customers can pay with USDT, USDC, SOL or ETH through a swap provider you configure, and you still receive Bitcoin over Lightning.
Plugins for WooCommerce, Easy Digital Downloads, PrestaShop, Odoo, Medusa, Vendure, Paymenter and FOSSBilling; libraries for Node.js, Python, PHP and Ruby on Rails.