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You are helping me integrate my iOS ePOS application with Teya card machines using the
Teya Unified ePOS SDK (POSLink: my ePOS and the Teya card machine are separate devices).

My stack: [describe your app language/framework, e.g. Swift/SwiftUI]

Key facts:
- Add the SDK via Swift Package Manager, package URL
  https://github.com/teya-engineering/teya-unified-epos-sdk-pod-spm (File -> Add Package Dependencies
  in Xcode, pin an exact version), or via CocoaPods with
  pod 'TeyaUnifiedEposSDK', :podspec => 'https://raw.githubusercontent.com/teya-engineering/teya-unified-epos-sdk-pod-spm/<version>/TeyaUnifiedEposSDK.podspec'
  (the SDK is not on the CocoaPods trunk any more, and :git installs an empty pod).
- If using SPM, I must also manually add the SDK's compose-resources folder to my target's
  Copy Bundle Resources build phase (Project settings -> Build Phases -> Copy Bundle
  Resources -> Add Other... -> select the compose-resources folder inside the
  TeyaUnifiedEposSDK.xcframework in DerivedData -> Create folder references).
- I need a Client ID and Client Secret from the Teya Developer Portal (partner.teya.xyz for
  development, partner.teya.com for production). This is one set for my whole application,
  not one per merchant - merchants authenticate separately with their own Teya ID.
- Initialize the SDK with:
  let teyaPosLinkSDK = TeyaPosLinkSDKKt.initialize(
      authConfig: PosLinkSDKAuthConfigManaged(clientId: "...", clientSecret: "..."),
      isProductionEnv: false,
      eposInstanceId: nil, // optional identifier for this ePOS instance
      logger: SDKLoggerImpl() // optional, implements the TeyaSDKLogger protocol
  )
- Call teyaPosLinkSDK.setup(onFailure:onSuccess:) to run the SDK's built-in UI for
  authentication, store selection, and card machine selection. After setup succeeds, use
  teyaPosLinkSDK.transactionsApi and teyaPosLinkSDK.printingApi.
- To make a payment, call teyaPosLinkSDK.transactionsApi.makePayment(transactionId:amount:
  currency:tip:). amount and tip are Int32 values in the smallest currency unit (e.g. cents,
  with tip needing conversion to KotlinInt) and currency is an ISO 4217 code (e.g. "GBP").
  This returns a subscription for real-time payment status updates.
- Tips, cancellations, refunds, receipts, and Pay at Table are additional SDK calls with
  real-time responses.

Documentation to follow (read these before writing code):
- https://docs.teya.com/epos-sdk/poslink/ios/getting-started
- https://docs.teya.com/epos-sdk/poslink/ios/make-payment
- https://docs.teya.com/epos-sdk/overview

Task: add the SDK package, implement the Connect to Teya flow via setup(), and implement a
basic make-payment call with result handling. Follow the documentation exactly and do not
invent SDK methods - if unsure of an API name, tell me to check the docs page rather than
guessing.