I am trying to add an in-app purchase into my app, but have not been successful.

I have added dependacy in build.gradle:

implementation 'com.android.billingclient:billing:6.2.1'

BillingClient.kt

package xyz.mikkm.jagobd

import android.app.Activity
import android.util.Log
import com.android.billingclient.api.*

class BillingClientWrapper(private val activity: Activity) : PurchasesUpdatedListener {
    private val billingClient: BillingClient = BillingClient.newBuilder(activity)
        .enablePendingPurchases()
        .setListener(this)
        .build()

    init {
        billingClient.startConnection(object : BillingClientStateListener {
            override fun onBillingSetupFinished(billingResult: BillingResult) {
                if (billingResult.responseCode == BillingClient.BillingResponseCode.OK) {
                    // Billing client is ready
                    Log.d("BillingClient", "Billing client setup finished.")
                } else {
                    // Error handling
                    Log.e("BillingClient", "Failed to set up billing client. Error code: ${billingResult.responseCode}")
                }
            }

            override fun onBillingServiceDisconnected() {
                // Try to restart the connection on the next request to
                // Google Play by calling the startConnection() method.
                Log.d("BillingClient", "Billing service disconnected.")
            }
        })
    }

    fun querySkuDetailsAsync(skuList: List<String>, listener: SkuDetailsResponseListener) {
        Log.d("BillingClient", "Querying SKU details for $skuList")
        val params = SkuDetailsParams.newBuilder()
            .setSkusList(skuList)
            .setType(BillingClient.SkuType.INAPP)
            .build()

        billingClient.querySkuDetailsAsync(params) { billingResult, skuDetailsList ->
            if (billingResult.responseCode == BillingClient.BillingResponseCode.OK) {
                listener.onSkuDetailsResponse(billingResult, skuDetailsList)
            } else {
                // Error handling
                Log.e("BillingClient", "Failed to query SKU details. Error code: ${billingResult.responseCode}")
                listener.onSkuDetailsResponse(billingResult, null)
            }
        }
    }

    fun launchBillingFlow(activity: Activity, skuDetails: SkuDetails) {
        val flowParams = BillingFlowParams.newBuilder()
            .setSkuDetails(skuDetails)
            .build()
        billingClient.launchBillingFlow(activity, flowParams)
    }

    override fun onPurchasesUpdated(billingResult: BillingResult, purchases: MutableList<Purchase>?) {
        if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && purchases != null) {
            for (purchase in purchases) {
                val sku = purchase.skus.firstOrNull() // Accessing the first SKU if multiple SKUs exist
                if (sku != null) {
                    // Handle purchase
                    Log.d("BillingClient", "Purchase successful: $sku")
                } else {
                    // Handle error: no SKU found
                    Log.e("BillingClient", "Failed to get SKU for purchase")
                }
            }
        } else if (billingResult.responseCode == BillingClient.BillingResponseCode.USER_CANCELED) {
            // Handle user cancelation
            Log.d("BillingClient", "User canceled the purchase")
        } else {
            // Handle other errors
            Log.e("BillingClient", "Failed to make a purchase. Error code: ${billingResult.responseCode}")
        }
    }
}

Then i initialize billing in MainActivity like this:

class MainActivity : AppCompatActivity(), View.OnClickListener {

    private lateinit var billingClientWrapper: BillingClientWrapper

    override fun onCreate(savedInstanceState: Bundle?) {
        // Initialize BillingClientWrapper
        billingClientWrapper = BillingClientWrapper(this)

        // Example usage: querying SKU details
        val skuList = listOf("premium")
        billingClientWrapper.querySkuDetailsAsync(skuList, object : SkuDetailsResponseListener {
            override fun onSkuDetailsResponse(billingResult: BillingResult, skuDetailsList: List<SkuDetails>?) {
                if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && skuDetailsList != null) {
                    // Update UI with SKU details
                    for (skuDetails in skuDetailsList) {
                        val sku = skuDetails.sku
                        val price = skuDetails.price
                        // Display sku and price in UI (e.g., ListView)
                        Log.d("BillingClient", "SKU: $sku, Price: $price")
                    }
                } else {
                    // Handle error
                    Log.e("BillingClient", "Failed to query SKU details. Error code: ${billingResult.responseCode}")
                }
            }
        })
    }

}

I also added in-app product at google play console.

When i run the app i have error:

2024-05-06 10:27:39.988  8551-8551  BillingClient           xyz.mikkm.jagobd                     D  Querying SKU details for [premium]
2024-05-06 10:27:39.992  8551-8551  BillingClient           xyz.mikkm.jagobd                     E  Failed to query SKU details. Error code: -1
2024-05-06 10:27:39.992  8551-8551  BillingClient           xyz.mikkm.jagobd                     E  Failed to query SKU details. Error code: -1

As i understand -1 is generic error code and doesnt show anything specific.

Anyone have any ideas ?

Thank you.