Yes, Bit Form currently supports PayPal, Stripe, Razorpay, and Mollie.
While there’s no UI for custom payment gateways at the moment, you can still trigger your own payment system using our action hooks and events. You can also save and manage transaction data using our webhook and functions.
You can follow this guide: https://bit-form.com/wp-docs/payments-setup/setup-custom-payment-webhook

If you need help integrating your specific gateway, feel free to reach out—we’d be happy to assist.
And if you’d like to suggest a gateway for future support, you can submit your request here: https://www.facebook.com/groups/bitapps/permalink/4088723257806464
Thanks for your interest in Bit Form!