Method purchase

src/plugins/iap/src/com/foxdebug/iap/Iap.java:261–320

(String productIdOrJson, CallbackContext callbackContext)

  }

  private void purchase(String productIdOrJson, CallbackContext callbackContext) {
    try {
      if (productIdOrJson == null || productIdOrJson.trim().isEmpty()) {
        callbackContext.error("Product ID cannot be null or empty");
        return;
      }
      
      final String productId = productIdOrJson;
      
      List<QueryProductDetailsParams.Product> productList = new ArrayList<>();
      productList.add(
        QueryProductDetailsParams.Product.newBuilder()
          .setProductId(productId)
          .setProductType(BillingClient.ProductType.INAPP)
          .build()
      );
      QueryProductDetailsParams params = QueryProductDetailsParams.newBuilder()
        .setProductList(productList)
        .build();
        
      billingClient.queryProductDetailsAsync(
        params,
        new ProductDetailsResponseListener() {
          public void onProductDetailsResponse(
            BillingResult billingResult,
            QueryProductDetailsResult queryProductDetailsResult
          ) {
            if (billingResult.getResponseCode() == BillingResponseCode.OK) {
              List<ProductDetails> productDetailsList = queryProductDetailsResult.getProductDetailsList();
              if (!productDetailsList.isEmpty()) {
                ProductDetails productDetails = productDetailsList.get(0);
                BillingResult result = billingClient.launchBillingFlow(
                  activityRef.get(),
                  BillingFlowParams.newBuilder().setProductDetailsParamsList(
                    Arrays.asList(
                      BillingFlowParams.ProductDetailsParams.newBuilder()
                        .setProductDetails(productDetails)
                        .build()
                    )
                  ).build()
                );
                int responseCode = result.getResponseCode();
                if (responseCode == BillingResponseCode.OK) {
                  callbackContext.success();
                } else {
                  callbackContext.error(responseCode);
                }
              } else {
                callbackContext.error("No product details found for: " + productId);
              }
            } else {
              callbackContext.error(billingResult.getResponseCode());
            }
          }
        }
      );
    } catch (Exception e) {
      callbackContext.error("Purchase error: " + e.getMessage());