Add Google Pay button to Drop-In View for Android SDK

Firstly, you will need to add DropInPaymentView in your activity xml file:

<com.trustpayments.mobile.ui.dropin.DropInPaymentView
android:id="@+id/dropInPaymentView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp" />

The following example code demonstrates how you can add the Google Pay button inside of the payment SDK's pre-built Drop-In view. The onActivityResult (i.e. the Google Pay wallet token) will need to be submitted in a payment authorisation request to Trust Payments for a payment to be completed. Please refer to the Requesting a payment authorisation page when you’re ready to process a payment.

// Need to implement the DropInPaymentView.DropInGooglePayPaymentViewListener
class YourActivity : Activity, DropInPaymentView.DropInGooglePayPaymentViewListener {
  private lateinit var tpGooglePayManager : TPGooglePayManager

  // Example interface implementation
  override fun onGooglePayClicked() {
    tpGooglePayManager.requestPayment(priceInCents)
  }
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // creating the Google Pay manager instance
    tpGooglePayManager = TPGooglePayManager.Builder(
      ...
    ).build()

    // Verify that Google Pay is supported by customer device & configuration is valid
    tpGooglePayManager.possiblyShowGooglePayButton(object : TPGooglePayManager.ShowGooglePayButtonCallback {
      override fun canShowButton(boolean: Boolean) {
        dropInPaymentView.setupForGooglePayPayment(boolean)
      }
    })
    dropInPaymentView.apply {
      setupForTokenizedPayment(emptySet(), null) // Use with the line bellow to hide card payment form
      setPayButtonVisibility(View.GONE)

      // Register the interface implementation in the drop-in payment view
      dropInGooglePayPaymentViewListener = this@YourActivity
    }
  }
  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    val googlePayWalletToken = tpGooglePayManager.onActivityResult(requestCode, resultCode, data)
    //Use googlePayWalletToken for processing a payment authorisation
  }
}