implementation("com.xsolla.android:store:latest.release")

package com.xsolla.androidsample

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.xsolla.android.store.XStore
import com.xsolla.android.store.callbacks.GetVirtualItemsCallback
import com.xsolla.android.store.entity.response.items.VirtualItemsResponse
import com.xsolla.androidsample.adapter.BuyItemAdapter

class StoreActivity : AppCompatActivity() {

    private lateinit var itemsView: RecyclerView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_store)

        XStore.init(<projectId>)

        initUI()
        loadVirtualItems()
    }

    private fun initUI() {
        itemsView = findViewById(R.id.buy_recycler_view)
        itemsView.layoutManager = LinearLayoutManager(this)
    }

    private fun loadVirtualItems() {
        val parentActivity = this
        XStore.getVirtualItems(object : GetVirtualItemsCallback {
            override fun onSuccess(response: VirtualItemsResponse) {
                itemsView.adapter = BuyItemAdapter(parentActivity, response.items.filter { item -> item.virtualPrices.isEmpty() && !item.isFree })
            }

            override fun onError(throwable: Throwable?, errorMessage: String?) {
                showNotificationMessage(errorMessage ?: throwable?.javaClass?.name ?: "Error")
            }
        })
    }

    private fun showNotificationMessage(message: String) {
        Toast.makeText(
            baseContext,
            message,
            Toast.LENGTH_SHORT,
        ).show()
    }
}

npm install -g firebase-tools

firebase init functions

// The Cloud Functions for Firebase SDK to create Cloud Functions and triggers.
const functions = require('firebase-functions/v1');

const projectId = <projectId>;
const apiKey = <apiKey>;

exports.getXsollaPaymentToken = functions.https.onRequest((req, res) => {

  const requestBody = req.body;
    if (!requestBody) {
      res.status(400).send('Request body is missing');
      return;
    }

  const userId = requestBody.data.uid;
  const email = requestBody.data.email;
  const sku = requestBody.data.sku;
  const returnUrl = requestBody.data.returnUrl;

  const payload = {
    user: {
      id: {value: userId},
      name: {
        value: email
      },
      email: {
        value: email
      },
      country: {
        value: 'US',
        allow_modify: false
      }
    },
    purchase: {
      items: [
        {
          sku: sku,
          quantity: 1
        }
      ]
    },
    sandbox: true,
    settings: {
      language: 'en',
      currency: 'USD',
      return_url: returnUrl,
      ui: {
        theme: '63295aab2e47fab76f7708e3'
      }
    }
  }

  let url = "https://store.xsolla.com/api/v3/project/" + projectId.toString() + "/admin/payment/token";

  fetch(
    url,
    {
      method: "POST",
      headers: {
        'Content-Type': 'application/json',
        Authorization: 'Basic ' + btoa(`${projectId}:${apiKey}`)
      },
      body: JSON.stringify(payload)
    },
  )
  .then(xsollaRes => {
    // Handle the response data
    if (xsollaRes.ok) {
      return xsollaRes.json();
    } else {
      throw new Error(`HTTP request failed with status ${xsollaRes.status} and statusText: ${xsollaRes.statusText}`)
    }
  })
  .then(data => {
    res.send(JSON.stringify(data));
  })
  .catch(error => {
    res.send("Error = " + error);
  });
});

exports.webhookFakeResponse = functions.https.onRequest((request, response) => {
  response.status(200).send()
})

firebase emulators:start

firebase deploy --only functions

implementation("com.xsolla.android:payments:latest.release")

<uses-permission android:name="android.permission.INTERNET" />

package com.xsolla.androidsample.adapter

import android.R.attr.duration
import android.os.Handler
import android.os.Looper
import android.view.LayoutInflater
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.xsolla.android.payments.XPayments
import com.xsolla.android.payments.data.AccessToken
import com.xsolla.android.store.entity.response.items.VirtualItemsResponse
import com.xsolla.androidsample.R
import com.xsolla.androidsample.StoreActivity
import org.json.JSONObject
import java.io.BufferedReader
import java.io.BufferedWriter
import java.io.OutputStream
import java.io.OutputStreamWriter
import java.net.HttpURLConnection
import java.net.URL


class BuyItemAdapter(private val parentActivity: StoreActivity, private val items: List<VirtualItemsResponse.Item>) :
    RecyclerView.Adapter<BuyItemViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BuyItemViewHolder {
        return BuyItemViewHolder( LayoutInflater.from(parent.context)
            .inflate(R.layout.buy_item_sample, parent, false))
    }

    override fun onBindViewHolder(holder: BuyItemViewHolder, position: Int) {
        val item = items[position]
        Glide.with(holder.view).load(item.imageUrl).into(holder.itemImage)
        holder.itemName.text = item.name
        holder.itemDescription.text = item.description
        var priceText: String
        if(item.virtualPrices.isNotEmpty()) {
            priceText = item.virtualPrices[0].getAmountRaw() + " " + item.virtualPrices[0].name
        } else {
            priceText = item.price?.getAmountRaw() + " " + item.price?.currency.toString()
        }

        holder.itemPrice.text = priceText

        holder.itemButton.setOnClickListener {
            Thread {
                purchase(item.sku!!)
            }.start()
        }
    }

    private fun purchase(sku: String) {

        val uid = parentActivity.intent.getStringExtra("uid")
        val email = parentActivity.intent.getStringExtra("email")

        val jsonBody = JSONObject()
        jsonBody.put("data", JSONObject().apply {
            put("uid", uid)
            put("email", email)
            put("sku", sku)
            put("returnUrl", "app://xpayment." + parentActivity.packageName)
        })

        val connection = URL(https://localhost:5001/{firebase-project-id}/us-central1/getXsollaPaymentToken).openConnection() as HttpURLConnection
        connection.requestMethod = "POST"
        connection.setRequestProperty("Content-Type", "application/json")
        connection.doOutput = true

        val outputStream: OutputStream = connection.outputStream
        val writer = BufferedWriter(OutputStreamWriter(outputStream))
        writer.write(jsonBody.toString())
        writer.flush()
        writer.close()

        val responseCode = connection.responseCode

        if (responseCode == HttpURLConnection.HTTP_OK) {
            val response = connection.inputStream.bufferedReader().use(BufferedReader::readText)
            connection.disconnect()

            val jsonObject = JSONObject(response)
            val token = jsonObject.getString("token")
            val orderId = jsonObject.getString("order_id")

            val intent = XPayments.createIntentBuilder(parentActivity)
                .accessToken(AccessToken(token))
                .isSandbox(true)
                .build()
            parentActivity.startActivityForResult(intent, 1)
        } else {
            Handler(Looper.getMainLooper()).post {
                showNotificationMessage("HTTP request failed with error: $responseCode")
            }
        }
    }

    override fun getItemCount() = items.size

    private fun showNotificationMessage(message: String) {
        Toast.makeText(
            parentActivity,
            message,
            Toast.LENGTH_SHORT,
        ).show()
    }
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == 1) {
            val (status, _) = XPayments.Result.fromResultIntent(data)
            when (status) {
                XPayments.Status.COMPLETED -> showNotificationMessage("Payment completed")
                XPayments.Status.CANCELLED -> showNotificationMessage("Payment canceled")
                XPayments.Status.UNKNOWN -> showNotificationMessage("Payment error")
            }
        }
    }