日割り計算と従量課金の実装
請求期間の途中で変更があった場合の日割り計算を理解・適用し、利用量に基づくサブスクリプションモデルの従量課金を設定します。
「日割り計算と従量課金の実装」はCoddyKit上の無料Stripe Payments & SaaS Billing Systemsレッスンです。 これはレッスン2/4です。 下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。 これはStripe Payments & SaaS Billing Systems学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Stripe Payments & SaaS Billing Systemsコースには全4レッスンが含まれています。
このレッスンの一部はまだ翻訳されておらず、英語で表示されています。
Flexible Billing: Intro
Welcome to advanced subscription features! Many businesses need more flexible billing than just a fixed monthly or yearly fee.
Today, we'll dive into two powerful concepts: prorations and metered billing. These allow you to handle mid-cycle changes and usage-based pricing with ease.
What are Prorations?
Imagine a customer upgrades their subscription plan halfway through their billing cycle. What happens to the money they already paid for the cheaper plan?
Proration is the process of proportionally adjusting charges when a subscription changes mid-cycle. Stripe automatically calculates this for you.
- Credit: For the unused portion of the old plan.
- Charge: For the new plan's usage up to the end of the current cycle.
Stripe's Proration Logic
When you modify a subscription in Stripe (e.g., changing the price or quantity of a subscription item), Stripe automatically calculates the proration.
It creates line items on the customer's invoice: a credit for the unused time on the old plan and a charge for the new plan from the change date to the end of the current billing period.
This ensures fairness and accuracy for both you and your customers.
Implementing Prorated Changes
When updating a subscription via the Stripe API, prorations are typically handled by default. You can also explicitly control this behavior using the proration_behavior parameter.
CREATE_PRORATIONS ensures that proration items are added to the invoice immediately or at the end of the cycle.
Try running this conceptual Java code:
import com.stripe.Stripe;
import com.stripe.param.SubscriptionUpdateParams;
public class Main {
public static void main(String[] args) {
// In a real app, you'd set Stripe.apiKey and handle exceptions.
// This snippet focuses on the update parameters.
String subscriptionItemId = "si_EXISTING_ITEM_ID";
String newPriceId = "price_NEW_PLAN_ID";
SubscriptionUpdateParams params =
SubscriptionUpdateParams.builder()
.addItem(
SubscriptionUpdateParams.Item.builder()
.setId(subscriptionItemId) // ID of the existing subscription item
.setPrice(newPriceId) // The new price for the subscription
.build()
)
.setProrationBehavior(SubscriptionUpdateParams.ProrationBehavior.CREATE_PRORATIONS)
.build();
System.out.println("Subscription update parameters created:");
System.out.println("- New Price ID: " + newPriceId);
System.out.println("- Proration Behavior: CREATE_PRORATIONS");
System.out.println("Stripe will automatically calculate and apply prorations.");
}
}What is Metered Billing?
Metered billing (or usage-based billing) charges customers based on how much of a service they actually use, rather than a fixed amount.
Think of utility bills (electricity, water) or cloud services (data storage, API calls). Customers only pay for what they consume.
- Examples: API requests, GB of storage, minutes of video streaming, number of active users.
Setting Up Metered Products
To implement metered billing, you first need to define a Product and a Price in Stripe with a usage_type set to metered.
This tells Stripe that the quantity for this price will be reported by your application, not fixed at subscription creation.
You'll also define the billing scheme (e.g., per_unit or tiered) and optional aggregation method.
Reporting Usage to Stripe
For metered billing, your application needs to track customer usage and report it to Stripe periodically, usually as it occurs or at regular intervals (e.g., daily).
This is done using the Usage Record API. You report the quantity of usage for a specific subscription_item.
Here's a conceptual Java example:
import com.stripe.Stripe;
import com.stripe.param.UsageRecordCreateParams;
public class Main {
public static void main(String[] args) {
// In a real app, you'd set Stripe.apiKey and handle exceptions.
// This snippet focuses on creating a usage record.
String subscriptionItemId = "si_METERED_ITEM_ID"; // The ID of the metered subscription item
long quantityUsed = 10L; // The amount of usage to report
UsageRecordCreateParams params =
UsageRecordCreateParams.builder()
.setQuantity(quantityUsed)
.setTimestamp(System.currentTimeMillis() / 1000L) // Current time in seconds since epoch
.setAction(UsageRecordCreateParams.Action.INCREMENT) // Add to existing usage
.build();
System.out.println("Usage record creation parameters created:");
System.out.println("- Subscription Item ID: " + subscriptionItemId);
System.out.println("- Quantity Reported: " + quantityUsed);
System.out.println("- Action: INCREMENT (adds to previous usage)");
System.out.println("This usage will be billed at the end of the current billing cycle.");
}
}How Metered Usage is Billed
Stripe aggregates all usage records reported for a specific metered subscription item within a billing period.
At the end of the billing cycle (or when an invoice is finalized), Stripe calculates the total usage and applies the corresponding price, adding it to the customer's invoice.
You can define how usage is aggregated (e.g., sum, last_ever, max) when creating the price.
Prorations vs. Metered: Recap
It's important to distinguish between prorations and metered billing:
- Prorations: Adjust charges for changes to fixed-price subscription items mid-cycle (e.g., upgrading from Basic to Pro plan).
- Metered Billing: Charges based on actual consumption of a service, with usage reported over time (e.g., paying per API call or GB of data).
Both offer powerful ways to make your billing more flexible and customer-friendly.
Quick Check: Flexible Billing
Which of the following scenarios would typically involve metered billing in Stripe?
Recap: Prorations & Metered
Great job! You've learned how to handle flexible billing scenarios with Stripe:
- Prorations: Automatically adjust charges when subscriptions change mid-cycle, ensuring fair billing.
- Metered Billing: Charge customers based on their actual consumption, requiring you to report usage via the Stripe API.
These features are crucial for building dynamic and scalable SaaS platforms. Keep exploring to master more advanced Stripe capabilities!
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- コース
- 12
- レッスン
- 48
よくある質問
「日割り計算と従量課金の実装」レッスンは無料ですか？
はい。「日割り計算と従量課金の実装」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Stripe Payments & SaaS Billing Systemsコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Stripe Payments & SaaS Billing Systemsコースには全4レッスンが含まれています。
「日割り計算と従量課金の実装」で何を学びますか？
請求期間の途中で変更があった場合の日割り計算を理解・適用し、利用量に基づくサブスクリプションモデルの従量課金を設定します。 ブラウザで直接実行するハンズオンコードでStripe Payments & SaaS Billing Systemsを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。
Stripe Payments & SaaS Billing Systemsを始めるのに経験は必要ですか？
事前経験は必要ありません。CoddyKitのStripe Payments & SaaS Billing Systemsは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。 これはレッスン2/4です。
「日割り計算と従量課金の実装」レッスンにはどのくらい時間がかかりますか？
ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。
このStripe Payments & SaaS Billing Systemsレッスンでコードを書いて実行できますか？
はい。すべてのStripe Payments & SaaS Billing Systemsレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。