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POST
JavaScript
このエンドポイントを使用して、サブスクリプションのアップグレードやダウングレード時に顧客に正確な料金を示します。これにより透明性が向上し、サポートへの問い合わせを減らすことができます。

ユースケース

  • チェックアウト確認: 顧客がプラン変更を確認する前に比例配分された料金を表示
  • 料金計算機: アプリケーションでアップグレード/ダウングレード計算機を構築
  • 顧客セルフサービス: 顧客が正確な価格でプランオプションを探求できるように
  • 割引検証: 重ね合わせた割引コードがプラン変更の価格にどのように影響するかをプレビュー
変更を確定する前に、スタックされた割引が即時の請求および新しいプランの価格にどのように影響するかを見るために、プレビューリクエストで discount_codes (20個までのコードの配列、順番に適用)を含めることができます。 単一の discount_code フィールドは廃止予定ですが、後方互換性のためにまだサポートされています。今後は discount_codes をお勧めします。

レスポンスフィールド

プレビュー応答には次のものが含まれます:
immediate_charge.summaryは請求される合計金額を含みます。顧客がプラン変更を確認する前に価格を表示するために使用してください。

承認

Authorization
string
header
必須

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

パスパラメータ

subscription_id
string
必須

Subscription Id

ボディ

application/json
product_id
string
必須

Unique identifier of the product to subscribe to

proration_billing_mode
enum<string>
必須

Proration Billing Mode

利用可能なオプション:
prorated_immediately,
full_immediately,
difference_immediately,
do_not_bill,
prorated_immediately_keep_cycle
quantity
integer<int32>
必須

Number of units to subscribe for. Must be at least 1.

必須範囲: x >= 0
adaptive_currency_fees_inclusive
boolean | null

Whether adaptive currency fees should be included in the price (true) or added on top (false). If not specified, uses the subscription's stored setting.

addons
Attach Addon Request · object[] | null

Addons for the new plan. Note : Leaving this empty would remove any existing addons

Cancel the payment link of a pending plan change, so that this change can replace it.

The link is cancelled only if the customer has not started to pay. A paid or in-progress payment gives a 409. A failed cancel gives a 503, and a retry is safe.

The request is validated before the cancel. A later failure, for example an amount below the minimum, leaves the subscription on its current plan with no open link. A retry is safe.

The preview route shares this request body and ignores this field.

cancel_scheduled_change_plan
boolean

Replace a scheduled plan change with this one.

The scheduled change is cancelled by the transaction that applies this change. A change that never applies leaves the schedule in place.

effective_at: next_billing_date is allowed. The new schedule then replaces the old one in the request transaction.

A pending plan change still gets a 409. This field does not affect it.

The preview route shares this request body, so a preview that sets this field also passes the scheduled-change 409.

Collect the plan-change amount with a payment link. The customer then pays on a checkout page.

The business needs the allow_plan_change_via_payment_link capability. The request needs effective_at: immediately. The request also needs on_payment_failure: prevent_change.

The preview route shares this request body and ignores this field.

discount_code
string | null
非推奨

DEPRECATED: Use discount_codes instead. Cannot be used together with discount_codes.

discount_codes
string[] | null

Stacked discount codes to apply to the new plan. Max 20. Cannot be used together with discount_code. If provided, replaces any existing discount codes. Empty array removes all discounts. If not provided (None), existing discounts with preserve_on_plan_change=true are preserved.

effective_at
enum<string>

When to apply the plan change.

  • immediately (default): Apply the plan change right away
  • next_billing_date: Schedule the change for the next billing date
利用可能なオプション:
immediately,
next_billing_date
metadata
null | Metadata · object

Metadata for the payment. If not passed, the metadata of the subscription will be taken

on_payment_failure
null | enum<string>

Controls behavior when the plan change payment fails.

  • prevent_change: Keep subscription on current plan until payment succeeds
  • apply_change (default): Apply plan change immediately regardless of payment outcome

With effective_at: next_billing_date, the plan change payment replaces the renewal payment. If that payment fails with prevent_change, the plan change is cancelled. The subscription then renews on the current plan, with the usual payment retries.

If not specified, uses the business-level default setting.

利用可能なオプション:
prevent_change,
apply_change
return_url
string | null

The URL that receives the customer after they pay the payment link. Needs collect_via_payment_link: true. Without it, the request gets a 422. A change that collects no money issues no link and does not use the URL. The preview route validates this field but does not use it.

The redirect adds subscription_id, payment_id and status. The status value is the status of the plan-change payment. It is not the status of the subscription. When that payment fails, the subscription stays active on its current plan. To try again, call this endpoint again to get a new link. The new plan can apply after the redirect, when the payment webhook arrives.

レスポンス

Preview of subscription plan change

immediate_charge
object
必須
new_plan
object
必須

Response struct representing subscription details

最終更新日 2026年5月22日