I’m trying to implement a google pay method of paying in my android jetpack compose app, but I get this error “Payment failed: 6: BuyFlow UI needs to be shown” when I run my code. The message is clear and I thought I was doing that by calling this line “val task = paymentsClient.loadPaymentData(paymentDataRequest)”, but it seems it doesn’t work.

This is the code from my viewModel that gets called when I press on the button to “pay now”

private fun getTransactionInfo(price: String): JSONObject {
        return JSONObject()
            .put("totalPrice", price)
            .put("totalPriceStatus", "FINAL")
            .put("countryCode", "US")  // Example country code (or use your specific country code)
            .put("currencyCode", "USD")  // Example currency code
    }

    private val merchantInfo: JSONObject =
        JSONObject().put("merchantName", "ACME")

    private fun getAllowedPaymentMethods(): JSONArray {
        val allowedPaymentMethods = JSONArray()

        val cardPaymentMethod = JSONObject()
            .put("type", "CARD")
            .put("parameters", JSONObject()
                .put("allowedAuthMethods", JSONArray(listOf("PAN_ONLY", "CRYPTOGRAM_3DS")))
                .put("allowedCardNetworks", JSONArray(listOf("AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"))))
            .put("tokenizationSpecification", JSONObject()
                .put("type", "PAYMENT_GATEWAY")
                .put("parameters", JSONObject()
                    .put("gateway", "stripe")
                    .put("gatewayMerchantId", "The code from my google wallet console next to my company name")))

        allowedPaymentMethods.put(cardPaymentMethod)

        return allowedPaymentMethods
    }


    fun getPaymentDataRequest(priceLabel: String): JSONObject {
        return JSONObject()
            .put("apiVersion", 2) // API version for Google Pay
            .put("apiVersionMinor", 0) // API minor version
            .put("allowedPaymentMethods", getAllowedPaymentMethods()) // This function will return allowed payment methods JSON
            .put("transactionInfo", getTransactionInfo(priceLabel))
            .put("merchantInfo", merchantInfo)
            .put("shippingAddressRequired", true)  // Example: Set whether shipping address is required
            .put("shippingAddressParameters", JSONObject()
                .put("phoneNumberRequired", false)
                .put("allowedCountryCodes", JSONArray(listOf("US", "GB"))))  // Shipping address restrictions
    }


    fun getGooglePayPaymentToken(activity: Activity, price: Int) {

        val walletOptions = WalletOptions.Builder()
            .setEnvironment(WalletConstants.ENVIRONMENT_TEST) // or ENVIRONMENT_PRODUCTION for real payments
            .build()


        val paymentsClient = Wallet.getPaymentsClient(activity, walletOptions)
        val isReadyToPayRequest = IsReadyToPayRequest.newBuilder()
            .addAllowedPaymentMethod(WalletConstants.PAYMENT_METHOD_CARD)

            .build()

        val task = paymentsClient.isReadyToPay(isReadyToPayRequest)
        task.addOnCompleteListener {
            if (it.isSuccessful) {
                val currency: String = "USD"

                Log.i("paymentViewModel", " inside getGooglePayPaymentToken")
                
                val paymentDataRequestJson = getPaymentDataRequest("12.34")

                val paymentDataRequest = PaymentDataRequest.fromJson(paymentDataRequestJson.toString())

                val task = paymentsClient.loadPaymentData(paymentDataRequest)
                Log.i("paymentViewModel", " After load Payment data")
                task.addOnCompleteListener { result: Task<PaymentData> ->
                    if (result.isSuccessful) {
                        Log.i("paymentViewModel", "Inside is succesful")
                        val paymentData = result.result
                        val paymentMethodNonce = paymentData?.paymentMethodToken?.token

                        if (paymentMethodNonce != null) {
                            // Send the Google Pay token to your backend
                            val googlePayPaymentObject =
                                GooglePayPaymentObject(price, currency, paymentMethodNonce)
                            initiateGooglePayPayment(price, googlePayPaymentObject)
                        } else {
                            // Handle error: No payment token received
                            Log.i("paymentViewModel", "Inside no token received")
                        }
                    } else {
                        // Handle error from Google Pay
                        Log.i("paymentViewModel", "Inside payment NOT successful")
                        Log.e("paymentViewModel", "Payment failed: ${result.exception?.message}")
                        // You can print the error message or inspect the exception for more details
                        result.exception?.printStackTrace() // Print the stack trace to log the error in more detail
                    }
                }
            }
        }
    }

So the code runs smoothly, the log statement “Log.i(“paymentViewModel”, ” After load Payment data”)” prints, but when I get to “task.addOnCompleteListener” it is not successful and this log statement prints the error “Log.e(“paymentViewModel”, “Payment failed ${result.exception?.message}”

I have juggled around with different ways to construct the “paymentDataRequest” i first tried with the deprecated “val paymentDataRequest = PaymentDataRequest.newBuilder()” and also with a custom data class to construct the paymentDataRequest, because I thought that the function val task = paymentsClient.loadPaymentData(paymentDataRequest) was having problem with the paymentDataRequest, but it didn’t work. Then I thought that I had a problem with my stripe configuration, but google pay is active and I have a verified domain id and I know that stripe works because I can pay with a test credit card and I don’t think the problem is there because the UI doesn’t load on my android app so i’m my code doesn’t even reach the stripe backend. So maybe there is a problem with my google pay api. I know that there is a section in the google pay and wallet console under google pay api that asks “Integrate with your Android app” but the link doesn’t work.