gopaycoin

gopaycoin is explicitly described as a 'completely self-hosted Bitcoin payment gateway' which directly aligns with the core concept of a payment processing platform. It offers features like accepting BTC payments, automatic refunds, and withdrawals, which are fundamental to payment processing. The mention of 'making just one API call' for payment creation indicates developer API integration. While it focuses on Bitcoin, the underlying functionality of processing payments, handling refunds, and providing an API for integration matches the core features of a payment platform. The website also mentions 'Processes refunds automatically if payment is not enough or overpaid' which implies a form of fraud detection or at least error handling related to payment amounts. It does not explicitly mention recurring billing, comprehensive dashboard/reporting, or other advanced features of a full-fledged payment platform like Stripe, but its core offering is clearly a payment gateway.