The Comprehensive Guide to Building Your Own Payment Gateway
Blog post from Basis Theory
A payment gateway is software that securely transmits customer payment information between a merchant’s website, acquiring bank, and payment processors, supporting functions such as fraud prevention, recurring billing, and multiple payment methods. Unlike a payment processor, which manages fund transfers, transaction routing, and chargebacks, a gateway focuses on securely communicating transaction data. Businesses may build proprietary gateways to reduce high-volume processing fees, tailor checkout experiences, gain direct control over authorization and fraud decisions, and support underserved regional payment methods or currencies. Development requires partnerships with processors or acquiring banks, potentially multiple integrations, and substantial resources, with an MVP estimated to take up to six months and cost roughly $200,000 to $250,000. Security and compliance are central requirements, including PCI DSS adherence, encryption, SSL/TLS, EMV, 3-D Secure, tokenization, and peer-to-peer encryption, while maintaining a secure cardholder data environment can be especially demanding. Tokenization providers can reduce a business’s PCI scope by securely handling sensitive card data, but creating a gateway remains a complex long-term undertaking that requires careful assessment of costs, risks, technical expertise, and regulatory responsibilities.
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