集成Google Pay的Android应用订阅价格调整技术问询：如何通过内部优惠券将20美元套餐降至17美元

Alright, let's break down how to apply that $3 discount to your Google Play subscription for specific users. Since you're using Google Pay (which integrates seamlessly with Google Play Billing), here are the most reliable, policy-compliant methods to adjust the subscription price to $17:

Google Play has native tools for handling discounts, which is the safest way to avoid policy violations and ensure smooth payment flow. Here's how to set it up:

• Create the Discount Promotion in Google Play Console:
  1. Navigate to your app in Google Play Console, go to Monetization > Subscriptions.
  2. Select your $20 subscription plan, then switch to the Promotions tab.
  3. Click Create promotion, choose "Discount" as the promotion type, and set the discount amount to $3 (or 15% off, since 3/20 equals 15%).
  4. Under Eligibility, pick "Custom eligibility" to define which users get this discount—you can target user segments, upload a list of user IDs/emails, or use your backend to flag eligible users.
• Redeem the Promotion in Your App:
  When eligible users navigate to the subscription screen, you'll need to fetch the promotion details and pass them to the BillingClient to apply the discount at checkout. Here's a Kotlin code snippet to handle this:

  // Fetch available promotions for the user
  val promotionQueryParams = QueryPromotionParams.newBuilder()
      .setProductIds(listOf("your_premium_subscription_id")) // Replace with your actual SKU
      .build()
  
  billingClient.queryPromotionDetailsAsync(promotionQueryParams) { billingResult, promotionDetails ->
      if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && !promotionDetails.isNullOrEmpty()) {
          // Grab your $3 discount promotion
          val discountPromotion = promotionDetails.first()
          // Build purchase params with the promotion code
          val billingFlowParams = BillingFlowParams.newBuilder()
              .setSkuDetails(yourRegular20DollarSkuDetails)
              .setPromotionCode(discountPromotion.promotionCode)
              .build()
          // Launch the Google Pay billing flow with the discount applied
          billingClient.launchBillingFlow(activity, billingFlowParams)
      }
  }
  

If you need simpler control (e.g., a one-time fixed discount for a small group), you can create a separate subscription SKU priced at $17:

• Set Up the Discounted SKU:
  In Google Play Console, add a new subscription plan with identical features to your $20 plan, but set the price to $17. Name it something like "Premium Subscription (Exclusive Discount)".
• Show the Correct SKU to Eligible Users:
  In your app, check if the user qualifies for the discount (verify via your backend to prevent abuse). If they do, display the $17 SKU instead of the regular $20 plan. If not, show the standard subscription option.

  Note: This approach is less flexible—you’ll need to create a new SKU if you want to adjust the discount amount later.

• Policy Compliance: Never handle discounts outside of Google Play Billing—this violates Google's terms of service and can lead to app removal.
• Security: Always verify user eligibility on your backend before applying any discount, to prevent unauthorized users from accessing the reduced price.
• Testing: Use Google Play's Internal Testing or Closed Testing tracks to test the discount flow with test users before rolling it out to your full audience.

内容的提问来源于stack exchange，提问作者abdallah