I want to start accepting payments worldwide through a lightweight 2-dimension (2D) gateway that processes standard e-commerce transactions without the 3-D Secure redirect. The gateway must authorise Credit and Debit Cards in real time, with full support for Visa, MasterCard and American Express, and settle funds in USD, EUR and GBP. Here is what I need from you: • A secure, PCI-compliant gateway or API I can host on my server or access through REST/JSON. • Straight-through processing for the three card networks above, including AVS/CVV checks and chargeback management hooks. • Currency conversion or multi-currency routing so that customers see prices and get charged in their chosen currency (USD, EUR or GBP) while I receive settled funds in one of those currencies. • Webhooks or callback URLs so my platform can update order status the moment the transaction is approved or declined. • Clear documentation and sample code (PHP or Node preferred, but language-agnostic REST is fine) so future developers can plug in quickly. • A short sandbox test cycle to prove authorisation, settlement, and error handling. When final testing shows clean authorisations and funds appearing in my settlement reports, I will consider the job complete.