PlayBillingLibrary4to5.kt

// Migrating queries to fetch all products (From skus to products)

// v4.0 - deprecated
val skuList = ArrayList<String>()
skuList.add("up_basic_sub")
val params = SkuDetailsParams.newBuilder()
params.setSkusList(skuList).setType(BillingClient.SkuType.SUBS)
billingClient.querySkuDetailsAsync(params.build()) {
                                   billingResult, skuDetailsList ->
    // Process the result
}

// v5.0 - new
val productList =
 listOf(QueryProductDetailsParams.Product.newBuilder()
        .setProductId("up_basic_sub")
        .setProductType( BillingClient.ProductType.SUBS).build())
val params = QueryProductDetailsParams.newBuilder()
          .setProductList(productList)
billingClient.queryProductDetailsAsync(params.build()) {
                                 billingResult, productDetailsList ->
    // Process the result
}

// ============================================================
// Migrating queries to launch the purchase flow

// v4.0 - deprecated
val activity : Activity = ...;
val billingFlowParams = BillingFlowParams.newBuilder()
  .setSkuDetails(skuDetails)
  .build()
val billingResult = billingClient.launchBillingFlow(activity, billingFlowParams)

// v5.0 - new
val offerToken = productDetails.subscriptionOfferDetails?.get(selectedOfferIndex)?.offerToken
val productDetailsParamsList = listOf(BillingFlowParams.ProductDetailsParams
         .newBuilder()
          .setProductDetails(productDetails)
          .setOfferToken(offerToken)
         .build())
val billingFlowParams = BillingFlowParams.newBuilder().setProductDetailsParamsList(productDetailsParamsList).build()
val billingResult = billingClient.launchBillingFlow(activity, billingFlowParams)


// =====================================================
// Migrating queries to fetch the purchases

// v4.0 - deprecated
billingClient.queryPurchasesAsync(BillingClient.SkuType.SUBS) { billingResult, purchaseList -> {
        // Process the result
    }
}

// v5.0 - new
billingClient.queryPurchasesAsync(QueryPurchasesParams.newBuilder()
    .setProductType(BillingClient.ProductType.SUBS)
    .build()) { billingResult, purchaseList ->
    // Process the result
}