Direct Connect API & SDKs

Direct Connect provides low-level POS-to-terminal communication via USB, serial, or network connections.

Available SDKs

Platform	SDK	Notes
Windows	DirectConnect.dll (C/C#)	Full EMV and contactless support
Linux	libdirectconnect.so	C/C++ bindings
Any	REST API	For networked terminal connections

Connection Types

• USB HID — Direct USB to terminal
• Serial (RS-232) — Legacy serial connection
• TCP/IP — Network-connected terminals

C# Quick Example

var terminal = new DirectConnectTerminal(new DirectConnectConfig {
    ConnectionType = ConnectionType.USB,
    ApiKey = "YOUR_PUBLIC_KEY"
});
terminal.Connect();
var result = terminal.ProcessSale(amount: 29.99m, orderID: "ORDER-789");
Console.WriteLine(result.IsApproved ? "Approved" : "Declined: " + result.ResponseText);