アプリ内決済を受け付ける

class MyCheckoutActivity : AppCompatActivity() {

  private lateinit var paymentSheet: PaymentSheet

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    // ...

    paymentSheet = PaymentSheet.Builder(
      paymentResultCallback = ::onPaymentSheetResult,
      createIntentCallback = { _, _ ->
        TODO() // You'll implement this later
      },
    ).build(this)
  }

  fun onPaymentSheetResult(paymentSheetResult: PaymentSheetResult) {
    // You'll implement this later
  }
}

class MyCheckoutActivity : AppCompatActivity() {

  // ...

  private fun handleCheckoutButtonPressed() {
    val intentConfig = PaymentSheet.IntentConfiguration(
      mode = PaymentSheet.IntentConfiguration.Mode.Payment(
        amount = 1099,
        currency = "usd",
      ),
      // Other configuration options...
    )

    paymentSheet.presentWithIntentConfiguration(
      intentConfiguration = intentConfig,
      // Optional configuration - See the "Customize the sheet" section in this guide
      configuration = PaymentSheet.Configuration.Builder(
        merchantDisplayName = "Example Inc.",
      ).build()
    )
  }
}

class MyCheckoutActivity : AppCompatActivity() {

  private lateinit var paymentSheet: PaymentSheet

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    // ...

    paymentSheet = PaymentSheet.Builder(
      paymentResultCallback = ::onPaymentSheetResult,
      createIntentCallback = { _, _ ->
        // Make a request to your server to create a PaymentIntent and return its client secret
        val networkResult = myNetworkClient.createIntent(
        )
        if (networkResult.isSuccess) {
            CreateIntentResult.Success(networkResult.clientSecret)
        } else {
            CreateIntentResult.Failure(networkResult.exception)
        }
      },
    ).build(this)
  }

  fun onPaymentSheetResult(paymentSheetResult: PaymentSheetResult) {
    // You'll implement this later
  }
}

class MyCheckoutActivity : AppCompatActivity() {

  // ...

  fun onPaymentSheetResult(paymentSheetResult: PaymentSheetResult) {
    when(paymentSheetResult) {
      is PaymentSheetResult.Canceled -> {
        // Customer canceled - you should probably do nothing.
      }
      is PaymentSheetResult.Failed -> {
        print("Error: ${paymentSheetResult.error}")
        // PaymentSheet encountered an unrecoverable error. You can display the error to the user, log it, etc.
      }
      is PaymentSheetResult.Completed -> {
        // Display, for example, an order confirmation screen
        print("Completed")
      }
    }
  }
}