Enable Test Mode — Tap to Pay on iPhone

Set the environment to .sandbox in your SDK initialization:

let config = CyoGateConfiguration(
    apiKey: "YOUR_SANDBOX_PUBLIC_KEY",
    environment: .sandbox
)
let sdk = CyoGateSDK(configuration: config)

Use sandbox API keys and test cards from the Test Card Simulator. A physical iPhone is required — the iOS Simulator is not supported for NFC.