....

app/src/main/java/com/base/filerecoveryrecyclebin/billing/BillingClientLifecycle.kt

 package com.base.filerecoveryrecyclebin.billing
 
+import android.content.Context
 import androidx.lifecycle.DefaultLifecycleObserver
+import com.android.billingclient.api.BillingClient
 import com.android.billingclient.api.Purchase
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 
-class BillingClientLifecycle : DefaultLifecycleObserver {
+class BillingClientLifecycle(
+    private val applicationContext: Context,
+) : DefaultLifecycleObserver {
 
     private val _subscriptionPurchases = MutableStateFlow<List<Purchase>>(emptyList())
     val subscriptionPurchases = _subscriptionPurchases.asStateFlow()
+
+
+    @Volatile
+    private var INSTANCE: BillingClientLifecycle? = null
+
+    fun getInstance(applicationContext: Context): BillingClientLifecycle =
+        INSTANCE ?: synchronized(this) {
+            INSTANCE ?: BillingClientLifecycle(applicationContext).also { INSTANCE = it }
+        }
 }
\ No newline at end of file

app/src/main/java/com/base/filerecoveryrecyclebin/billing/BillingViewModel.kt

@@ -3,16 +3,25 @@ package com.base.filerecoveryrecyclebin.billing
 import android.app.Application
 import android.content.Context
 import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.MutableLiveData
+import com.android.billingclient.api.BillingClient
+import com.android.billingclient.api.ProductDetails
+
+class BillingViewModel(val application: Application) : AndroidViewModel(application) {
+
+    private lateinit var billingClient: BillingClient
 
-class BillingViewModel(application: Application) : AndroidViewModel(application) {
 
 //    val billingClientLifecycle: BillingClientLifecycle
 //        get() = BillingClientLifecycle.getInstance(this)
-//
-//    @Volatile
-//    private var INSTANCE: BillingClientLifecycle? = null
-//    fun getInstance(applicationContext: Context): BillingClientLifecycle =
-//        INSTANCE ?: synchronized(this) {
-//            INSTANCE ?: BillingClientLifecycle(applicationContext).also { INSTANCE = it }
-//        }
+
+    @Volatile
+    private var INSTANCE: BillingClientLifecycle? = null
+    fun getInstance(applicationContext: Context): BillingClientLifecycle =
+        INSTANCE ?: synchronized(this) {
+            INSTANCE ?: BillingClientLifecycle(application.applicationContext).also { INSTANCE = it }
+        }
+
+    val basicSubProductWithProductDetails = MutableLiveData<ProductDetails?>()
+
 }
\ No newline at end of file