# PATCH /subscriptions/{subscription_id}/preview

**Preview an update to a subscription**

Previews an update for a subscription without applying those changes. Typically used for previewing proration before making changes to a subscription.

If successful, your response includes `immediate_transaction`, `next_transaction`, and `recurring_transaction_details` so you can see expected transactions for the changes.

The `update_summary` object contains details of prorated credits and charges created, along with the overall result of the update.

**Required permissions:** `subscription.read`

## Path parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `subscription_id` | string | required | Paddle ID of the subscription entity to work with. |

## Request body

- `customer_id`: string — Paddle ID of the customer that this subscription is for, prefixed with `ctm_`. Include to change the customer for a subscription. (pattern: `^ctm_[a-z\d]{26}$`)
- `address_id`: string — Paddle ID of the address that this subscription is for, prefixed with `add_`. Include to change the address for a subscription. (pattern: `^add_[a-z\d]{26}$`)
- `business_id` — Paddle ID of the business that this subscription is for, prefixed with `biz_`. Include to change the business for a subscription.
- `currency_code`: string — Supported three-letter ISO 4217 currency code. Include to change the currency that a subscription bills in. When changing `collection_mode` to `manual`, you may need to change currency code to `USD`, `EUR`, or `GBP`.
- `next_billed_at`: string (date-time) — RFC 3339 datetime string of when this subscription is next scheduled to be billed. Include to change the next billing date.
- `discount` — Details of the discount applied to this subscription. Include to add a discount to a subscription. `null` to remove a discount.
- `collection_mode`: string — How payment is collected for transactions created for this subscription. `automatic` for checkout, `manual` for invoices.
- `billing_details` — Details for invoicing. Required if `collection_mode` is `manual`. `null` if changing `collection_mode` to `automatic`.
- `scheduled_change`: null — Change that's scheduled to be applied to a subscription. When updating, you may only set to `null` to remove a scheduled change. Use the pause subscription, cancel subscription, and resume subscription operations to create scheduled changes.
- `items`: array — List of items on this subscription. Only recurring items may be added. Send the complete list of items that should be on this subscription, including existing items to retain. (Items: 1–100)
- `custom_data` — Your own structured key-value data.
- `proration_billing_mode`: string — How Paddle should handle proration calculation for changes made to a subscription or its items. Required when making
changes that impact billing.

For automatically-collected subscriptions, responses may take longer than usual if a proration billing mode that
collects for payment immediately is used.
- `on_payment_failure`: string — How Paddle should handle changes made to a subscription or its items if the payment fails during update. If omitted, defaults to `prevent_change`.

### Request example

```json
{
  "items": [
    {
      "price_id": "pri_01gsz8x8sawmvhz1pv30nge1ke",
      "quantity": 20
    },
    {
      "price_id": "pri_01h1vjfevh5etwq3rb416a23h2",
      "quantity": 1
    },
    {
      "price_id": "pri_01gsz95g2zrkagg294kpstx54r",
      "quantity": 1
    }
  ],
  "proration_billing_mode": "prorated_immediately"
}
```

## Response (200)

- `data`: object (required) — Represents a subscription preview when previewing a subscription.
  - `status`: string (required) — Status of this subscription. Set automatically by Paddle. Use the pause subscription or cancel subscription operations to change.
  - `customer_id`: string (required) — Paddle ID of the customer that this subscription is for, prefixed with `ctm_`. (pattern: `^ctm_[a-z\d]{26}$`)
  - `address_id`: string (required) — Paddle ID of the address that this subscription is for, prefixed with `add_`. (pattern: `^add_[a-z\d]{26}$`)
  - `business_id` (required) — Paddle ID of the business that this subscription is for, prefixed with `biz_`.
  - `currency_code`: string (required) — Supported three-letter ISO 4217 currency code. Transactions for this subscription are created in this currency. Must be `USD`, `EUR`, or `GBP` if `collection_mode` is `manual`.
  - `created_at`: string (date-time) (required) — RFC 3339 datetime string of when this entity was created. Set automatically by Paddle.
  - `updated_at`: string (date-time) (required) — RFC 3339 datetime string of when this entity was updated. Set automatically by Paddle.
  - `started_at` (required) — RFC 3339 datetime string of when this subscription started. This may be different from `first_billed_at` if the subscription started in trial.
  - `first_billed_at` (required) — RFC 3339 datetime string of when this subscription was first billed. This may be different from `started_at` if the subscription started in trial.
  - `next_billed_at` (required) — RFC 3339 datetime string of when this subscription is next scheduled to be billed.
  - `paused_at` (required) — RFC 3339 datetime string of when this subscription was paused. Set automatically by Paddle when the pause subscription operation is used. `null` if not paused.
  - `canceled_at` (required) — RFC 3339 datetime string of when this subscription was canceled. Set automatically by Paddle when the cancel subscription operation is used. `null` if not canceled.
  - `discount` (required) — Details of the discount applied to this subscription.
  - `collection_mode`: string (required) — How payment is collected for transactions created for this subscription. `automatic` for checkout, `manual` for invoices.
  - `billing_details` (required) — Details for invoicing. Required if `collection_mode` is `manual`.
  - `current_billing_period` (required) — Current billing period for this subscription. Set automatically by Paddle based on the billing cycle. `null` for `paused` and `canceled` subscriptions.
  - `billing_cycle`: object (required) — How often this subscription renews. Set automatically by Paddle based on the prices on this subscription.
    - `interval`: string (required) — Unit of time.
    - `frequency`: integer (required) — Amount of time. (Min: 1)
  - `scheduled_change` (required) — Change that's scheduled to be applied to a subscription. Use the pause subscription, cancel subscription, and resume subscription operations to create scheduled changes. `null` if no scheduled changes.
  - `management_urls`: object (required) — Customer portal deep links for this subscription.

Authenticated links are only returned when your API key has Customer portal session (Write) permission. For security, the `token` appended to authenticated links is temporary. You shouldn't store them.
    - `update_payment_method` (required) — Link to the page for this subscription in the customer portal with the payment method update form pre-opened. Use as part of workflows to let customers update their payment details. `null` for manually-collected subscriptions.
    - `cancel`: string (uri) (required) — Link to the page for this subscription in the customer portal with the subscription cancellation form pre-opened. Use as part of cancel subscription workflows.
  - `items`: array (required) — List of items on this subscription. Only recurring items are returned. (Items: 1–100)
  - `custom_data` (required) — Your own structured key-value data.
  - `immediate_transaction` (required) — Preview of the immediate transaction created as a result of changes to the subscription. Returns a complete object where `proration_billing_mode` is `prorated_immediately` or `full_immediately`; `null` otherwise.
  - `next_transaction` (required) — Preview of the next transaction for this subscription. Includes charges created where `proration_billing_mode` is `prorated_next_billing_period` or `full_next_billing_period`, as well as one-time charges. `null` if the subscription is scheduled to cancel or pause.
  - `recurring_transaction_details`: object (required) — Preview of the recurring transaction for this subscription. This is what the customer can expect to be billed when there are no prorated or one-time charges.
    - `tax_rates_used`: array (required) — List of tax rates applied to this transaction preview.
    - `totals`: object (required) — Breakdown of the total for a transaction preview. `fee` and `earnings` always return `null` for transaction previews.
      - `subtotal`: string (required) — Subtotal before discount, tax, and deductions. If an item, unit price multiplied by quantity.
      - `discount`: string (required) — Total discount as a result of any discounts applied.

Except for percentage discounts, Paddle applies tax to discounts based on the line item `price.tax_mode`. If `price.tax_mode` for a line item is `internal`, Paddle removes tax from the discount applied.
      - `tax`: string (required) — Total tax on the subtotal.
      - `total`: string (required) — Total after discount and tax.
      - `credit`: string (required) — Total credit applied to this transaction. This includes credits applied using a customer's credit balance and adjustments to a `billed` transaction.
      - `credit_to_balance`: string (required) — Additional credit generated from negative `details.line_items`. This credit is added to the customer balance.
      - `balance`: string (required) — Total due on a transaction after credits and any payments.
      - `grand_total`: string (required) — Total due on a transaction after credits but before any payments.
      - `grand_total_tax`: string (required) — Net tax amount included in `grand_total`. Equals the full `tax` amount unless credits are applied, in which case this value is proportionally reduced.
      - `fee` (required) — Total fee taken by Paddle for this transaction. `null` until the transaction is `completed` and the fee is processed.
      - `earnings` (required) — Total earnings for this transaction. This is the total minus the Paddle fee. `null` until the transaction is `completed` and the fee is processed.
      - `currency_code`: string (required) — Three-letter ISO 4217 currency code of the currency used for this transaction.
    - `line_items`: array (required) — Information about line items for this transaction preview. Different from transaction preview `items` as they include totals calculated by Paddle. Considered the source of truth for line item totals.
  - `update_summary` (required)
  - `import_meta` (required) — Import information for this entity. `null` if this entity is not imported.
  - `consent_requirements`: array (required) — List of active consent requirements for the subscription's current billing period.
- `meta`: object (required) — Information about this response.
  - `request_id`: string (required) — Unique ID for the request relating to this response. Provide this when contacting Paddle support about a specific request.

### Response example

```json
{
  "data": {
    "status": "active",
    "customer_id": "ctm_01hrffh7gvp29kc7xahm8wddwa",
    "address_id": "add_01hxh60j19j6gj877cywv20g13",
    "business_id": null,
    "currency_code": "USD",
    "created_at": "2024-05-10T12:01:47.199Z",
    "updated_at": "2024-05-13T10:36:58.039Z",
    "started_at": "2024-05-10T12:01:46.293348Z",
    "first_billed_at": "2024-05-10T12:01:46.293348Z",
    "next_billed_at": "2024-06-10T12:01:46.293348Z",
    "paused_at": null,
    "canceled_at": null,
    "collection_mode": "automatic",
    "billing_details": null,
    "current_billing_period": {
      "starts_at": "2024-05-10T12:01:46.293348Z",
      "ends_at": "2024-06-10T12:01:46.293348Z"
    },
    "billing_cycle": {
      "frequency": 1,
      "interval": "month"
    },
    "recurring_transaction_details": {
      "tax_rates_used": [
        {
          "tax_rate": "0.08875",
          "totals": {
            "subtotal": "95000",
            "discount": "0",
            "tax": "8431",
            "total": "103431"
          }
        }
      ],
      "totals": {
        "subtotal": "95000",
        "tax": "8431",
        "discount": "0",
        "total": "103431",
        "fee": null,
        "credit": "0",
        "credit_to_balance": "0",
        "balance": "103431",
        "grand_total": "103431",
        "grand_total_tax": "8431",
        "earnings": null,
        "currency_code": "USD"
      },
      "line_items": [
        {
          "price_id": "pri_01h1vjfevh5etwq3rb416a23h2",
          "quantity": 1,
          "totals": {
            "subtotal": "10000",
            "tax": "887",
            "discount": "0",
            "total": "10887"
          },
          "product": {
            "id": "pro_01h1vjes1y163xfj1rh1tkfb65",
            "name": "Analytics addon",
            "type": "standard",
            "tax_category": "standard",
            "description": "Unlock advanced insights into your flight data with enhanced analytics and reporting features. Includes customizable reporting templates and trend analysis across flights.",
            "image_url": "https://paddle.s3.amazonaws.com/user/165798/97dRpA6SXzcE6ekK9CAr_analytics.png",
            "custom_data": null,
            "status": "active",
            "import_meta": null,
            "created_at": "2023-06-01T13:30:50.302Z",
            "updated_at": "2024-04-05T15:47:17.163Z"
          },
          "tax_rate": "0.08875",
          "unit_totals": {
            "subtotal": "10000",
            "discount": "0",
            "tax": "887",
            "total": "10887"
          },
          "proration": {
            "rate": "1",
            "billing_period": {
              "starts_at": "2024-05-10T12:01:46.293348Z",
              "ends_at": "2024-06-10T12:01:46.293348Z"
            }
          }
        },
        {
          "price_id": "pri_01gsz95g2zrkagg294kpstx54r",
          "quantity": 1,
          "totals": {
            "subtotal": "25000",
            "tax": "2219",
            "discount": "0",
            "total": "27219"
          },
          "product": {
            "id": "pro_01gsz92krfzy3hcx5h5rtgnfwz",
            "name": "VIP support",
            "type": "standard",
            "tax_category": "standard",
            "description": "Get exclusive access to our expert team of product specialists, available to help you make the most of your AeroEdit subscription.",
            "image_url": "https://paddle.s3.amazonaws.com/user/165798/qgyipKJwRtq98YNboipo_vip-support.png",
            "custom_data": null,
            "status": "active",
            "import_meta": null,
            "created_at": "2023-02-23T13:58:17.615Z",
            "updated_at": "2024-04-05T15:44:02.893Z"
          },
          "tax_rate": "0.08875",
          "unit_totals": {
            "subtotal": "25000",
            "discount": "0",
            "tax": "2219",
            "total": "27219"
          },
          "proration": {
            "rate": "1",
            "billing_period": {
              "starts_at": "2024-05-10T12:01:46.293348Z",
              "ends_at": "2024-06-10T12:01:46.293348Z"
            }
          }
        },
        {
          "price_id": "pri_01gsz8x8sawmvhz1pv30nge1ke",
          "quantity": 20,
          "totals": {
            "subtotal": "60000",
            "tax": "5325",
            "discount": "0",
            "total": "65325"
          },
          "product": {
            "id": "pro_01gsz4t5hdjse780zja8vvr7jg",
            "name": "AeroEdit Pro",
            "type": "standard",
            "tax_category": "standard",
            "description": "Designed for professional pilots, including all features plus in Basic plus compliance monitoring, route optimization, and third-party integrations.",
            "image_url": "https://paddle.s3.amazonaws.com/user/165798/bT1XUOJAQhOUxGs83cbk_pro.png",
            "custom_data": {
              "features": {
                "aircraft_performance": true,
                "compliance_monitoring": true,
                "flight_log_management": true,
                "payment_by_invoice": false,
                "route_planning": true,
                "sso": false
              },
              "suggested_addons": [
                "pro_01h1vjes1y163xfj1rh1tkfb65",
                "pro_01gsz97mq9pa4fkyy0wqenepkz"
              ],
              "upgrade_description": "Move from Basic to Pro to take advantage of aircraft performance, advanced route planning, and compliance monitoring."
            },
            "status": "active",
            "import_meta": null,
            "created_at": "2023-02-23T12:43:46.605Z",
            "updated_at": "2024-04-05T15:53:44.687Z"
          },
          "tax_rate": "0.08875",
          "unit_totals": {
            "subtotal": "3000",
            "discount": "0",
            "tax": "266",
            "total": "3266"
          },
          "proration": {
            "rate": "1",
            "billing_period": {
              "starts_at": "2024-05-10T12:01:46.293348Z",
              "ends_at": "2024-06-10T12:01:46.293348Z"
            }
          }
        }
      ]
    },
    "next_transaction": {
      "billing_period": {
        "starts_at": "2024-06-10T12:01:46.293348Z",
        "ends_at": "2024-07-10T12:01:46.293348Z"
      },
      "details": {
        "tax_rates_used": [
          {
            "tax_rate": "0.08875",
            "totals": {
              "subtotal": "95000",
              "discount": "0",
              "tax": "8431",
              "total": "103431"
            }
          }
        ],
        "totals": {
          "subtotal": "95000",
          "tax": "8431",
          "discount": "0",
          "total": "103431",
          "fee": null,
          "credit": "0",
          "credit_to_balance": "0",
          "balance": "103431",
          "grand_total": "103431",
          "grand_total_tax": "8431",
          "earnings": null,
          "currency_code": "USD"
        },
        "line_items": [
          {
            "price_id": "pri_01h1vjfevh5etwq3rb416a23h2",
            "quantity": 1,
            "totals": {
              "subtotal": "10000",
              "tax": "887",
              "discount": "0",
              "total": "10887"
            },
            "product": {
              "id": "pro_01h1vjes1y163xfj1rh1tkfb65",
              "name": "Analytics addon",
              "type": "standard",
              "tax_category": "standard",
              "description": "Unlock advanced insights into your flight data with enhanced analytics and reporting features. Includes customizable reporting templates and trend analysis across flights.",
              "image_url": "https://paddle.s3.amazonaws.com/user/165798/97dRpA6SXzcE6ekK9CAr_analytics.png",
              "custom_data": null,
              "status": "active",
              "import_meta": null,
              "created_at": "2023-06-01T13:30:50.302Z",
              "updated_at": "2024-04-05T15:47:17.163Z"
            },
            "tax_rate": "0.08875",
            "unit_totals": {
              "subtotal": "10000",
              "discount": "0",
              "tax": "887",
              "total": "10887"
            },
            "proration": {
              "rate": "1",
              "billing_period": {
                "starts_at": "2024-06-10T12:01:46.293348Z",
                "ends_at": "2024-07-10T12:01:46.293348Z"
              }
            }
          },
          {
            "price_id": "pri_01gsz95g2zrkagg294kpstx54r",
            "quantity": 1,
            "totals": {
              "subtotal": "25000",
              "tax": "2219",
              "discount": "0",
              "total": "27219"
            },
            "product": {
              "id": "pro_01gsz92krfzy3hcx5h5rtgnfwz",
              "name": "VIP support",
              "type": "standard",
              "tax_category": "standard",
              "description": "Get exclusive access to our expert team of product specialists, available to help you make the most of your AeroEdit subscription.",
              "image_url": "https://paddle.s3.amazonaws.com/user/165798/qgyipKJwRtq98YNboipo_vip-support.png",
              "custom_data": null,
              "status": "active",
              "import_meta": null,
              "created_at": "2023-02-23T13:58:17.615Z",
              "updated_at": "2024-04-05T15:44:02.893Z"
            },
            "tax_rate": "0.08875",
            "unit_totals": {
              "subtotal": "25000",
              "discount": "0",
              "tax": "2219",
              "total": "27219"
            },
            "proration": {
              "rate": "1",
              "billing_period": {
                "starts_at": "2024-06-10T12:01:46.293348Z",
                "ends_at": "2024-07-10T12:01:46.293348Z"
              }
            }
          },
          {
            "price_id": "pri_01gsz8x8sawmvhz1pv30nge1ke",
            "quantity": 20,
            "totals": {
              "subtotal": "60000",
              "tax": "5325",
              "discount": "0",
              "total": "65325"
            },
            "product": {
              "id": "pro_01gsz4t5hdjse780zja8vvr7jg",
              "name": "AeroEdit Pro",
              "type": "standard",
              "tax_category": "standard",
              "description": "Designed for professional pilots, including all features plus in Basic plus compliance monitoring, route optimization, and third-party integrations.",
              "image_url": "https://paddle.s3.amazonaws.com/user/165798/bT1XUOJAQhOUxGs83cbk_pro.png",
              "custom_data": {
                "features": {
                  "aircraft_performance": true,
                  "compliance_monitoring": true,
                  "flight_log_management": true,
                  "payment_by_invoice": false,
                  "route_planning": true,
                  "sso": false
                },
                "suggested_addons": [
                  "pro_01h1vjes1y163xfj1rh1tkfb65",
                  "pro_01gsz97mq9pa4fkyy0wqenepkz"
                ],
                "upgrade_description": "Move from Basic to Pro to take advantage of aircraft performance, advanced route planning, and compliance monitoring."
              },
              "status": "active",
              "import_meta": null,
              "created_at": "2023-02-23T12:43:46.605Z",
              "updated_at": "2024-04-05T15:53:44.687Z"
            },
            "tax_rate": "0.08875",
            "unit_totals": {
              "subtotal": "3000",
              "discount": "0",
              "tax": "266",
              "total": "3266"
            },
            "proration": {
              "rate": "1",
              "billing_period": {
                "starts_at": "2024-06-10T12:01:46.293348Z",
                "ends_at": "2024-07-10T12:01:46.293348Z"
              }
            }
          }
        ]
      },
      "adjustments": []
    },
    "immediate_transaction": {
      "billing_period": {
        "starts_at": "2024-05-13T10:36:59.473Z",
        "ends_at": "2024-06-10T12:01:46.293348Z"
      },
      "details": {
        "tax_rates_used": [
          {
            "tax_rate": "0.08875",
            "totals": {
              "subtotal": "72410",
              "discount": "0",
              "tax": "6428",
              "total": "78838"
            }
          }
        ],
        "totals": {
          "subtotal": "72410",
          "tax": "6428",
          "discount": "0",
          "total": "78838",
          "fee": null,
          "credit": "0",
          "credit_to_balance": "0",
          "balance": "78838",
          "grand_total": "78838",
          "grand_total_tax": "6428",
          "earnings": null,
          "currency_code": "USD"
        },
        "line_items": [
          {
            "price_id": "pri_01gsz95g2zrkagg294kpstx54r",
            "quantity": 1,
            "totals": {
              "subtotal": "22628",
              "tax": "2009",
              "discount": "0",
              "total": "24637"
            },
            "product": {
              "id": "pro_01gsz92krfzy3hcx5h5rtgnfwz",
              "name": "VIP support",
              "type": "standard",
              "tax_category": "standard",
              "description": "Get exclusive access to our expert team of product specialists, available to help you make the most of your AeroEdit subscription.",
              "image_url": "https://paddle.s3.amazonaws.com/user/165798/qgyipKJwRtq98YNboipo_vip-support.png",
              "custom_data": null,
              "status": "active",
              "import_meta": null,
              "created_at": "2023-02-23T13:58:17.615Z",
              "updated_at": "2024-04-05T15:44:02.893Z"
            },
            "tax_rate": "0.08875",
            "unit_totals": {
              "subtotal": "22628",
              "discount": "0",
              "tax": "2009",
              "total": "24637"
            },
            "proration": {
              "rate": "0.90513",
              "billing_period": {
                "starts_at": "2024-05-13T10:36:57.967Z",
                "ends_at": "2024-06-10T12:01:46.293348Z"
              }
            }
          },
          {
            "price_id": "pri_01gsz8x8sawmvhz1pv30nge1ke",
            "quantity": 20,
            "totals": {
              "subtotal": "54308",
              "tax": "4820",
              "discount": "0",
              "total": "59128"
            },
            "product": {
              "id": "pro_01gsz4t5hdjse780zja8vvr7jg",
              "name": "AeroEdit Pro",
              "type": "standard",
              "tax_category": "standard",
              "description": "Designed for professional pilots, including all features plus in Basic plus compliance monitoring, route optimization, and third-party integrations.",
              "image_url": "https://paddle.s3.amazonaws.com/user/165798/bT1XUOJAQhOUxGs83cbk_pro.png",
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