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POST
/
subscriptions
/
{subscription_id}
/
change-plan
/
preview
JavaScript
import DodoPayments from 'dodopayments';

const client = new DodoPayments({
  bearerToken: process.env['DODO_PAYMENTS_API_KEY'], // This is the default and can be omitted
});

const response = await client.subscriptions.previewChangePlan('subscription_id', {
  product_id: 'product_id',
  proration_billing_mode: 'prorated_immediately',
  quantity: 0,
});

console.log(response.immediate_charge);
{
  "immediate_charge": {
    "line_items": [
      {
        "currency": "AED",
        "id": "<string>",
        "product_id": "<string>",
        "proration_factor": 123,
        "quantity": 123,
        "tax_inclusive": true,
        "type": "subscription",
        "unit_price": 123,
        "description": "<string>",
        "name": "<string>",
        "tax": 123,
        "tax_rate": 123
      }
    ],
    "summary": {
      "currency": "AED",
      "customer_credits": 123,
      "settlement_amount": 123,
      "settlement_currency": "AED",
      "total_amount": 123,
      "settlement_tax": 123,
      "tax": 123
    }
  },
  "new_plan": {
    "addons": [
      {
        "addon_id": "<string>",
        "quantity": 123
      }
    ],
    "billing": {
      "country": "AF",
      "city": "<string>",
      "state": "<string>",
      "street": "<string>",
      "zipcode": "<string>"
    },
    "cancel_at_next_billing_date": true,
    "created_at": "2023-11-07T05:31:56Z",
    "currency": "AED",
    "customer": {
      "customer_id": "<string>",
      "email": "<string>",
      "name": "<string>",
      "metadata": {},
      "phone_number": "<string>"
    },
    "metadata": {},
    "meters": [
      {
        "currency": "AED",
        "free_threshold": 123,
        "measurement_unit": "<string>",
        "meter_id": "<string>",
        "name": "<string>",
        "price_per_unit": "10.50",
        "description": "<string>"
      }
    ],
    "next_billing_date": "2023-11-07T05:31:56Z",
    "on_demand": true,
    "payment_frequency_count": 123,
    "payment_frequency_interval": "Day",
    "previous_billing_date": "2023-11-07T05:31:56Z",
    "product_id": "<string>",
    "quantity": 123,
    "recurring_pre_tax_amount": 123,
    "status": "pending",
    "subscription_id": "<string>",
    "subscription_period_count": 123,
    "subscription_period_interval": "Day",
    "tax_inclusive": true,
    "trial_period_days": 123,
    "cancelled_at": "2023-11-07T05:31:56Z",
    "custom_field_responses": [
      {
        "key": "<string>",
        "value": "<string>"
      }
    ],
    "discount_cycles_remaining": 123,
    "discount_id": "<string>",
    "expires_at": "2023-11-07T05:31:56Z",
    "payment_method_id": "<string>",
    "tax_id": "<string>"
  }
}
Use this endpoint to show customers exactly what they’ll be charged when upgrading or downgrading their subscription, improving transparency and reducing support requests.

​
Use Cases

  • Checkout confirmation: Display the prorated charge before customers confirm a plan change
  • Pricing calculators: Build upgrade/downgrade calculators in your application
  • Customer self-service: Let customers explore plan options with accurate pricing

​
Response Fields

The preview response includes:
FieldDescription
immediate_chargeThe charge that would be created immediately, including line items and summary
new_planThe full subscription object showing how it would look after the plan change
The immediate_charge.summary contains the total amount that would be charged. Use this to display pricing to your customers before they confirm the plan change.

Authorizations

​
Authorization
string
header
required

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

Path Parameters

​
subscription_id
string
required

Subscription Id

Body

application/json
​
product_id
string
required

Unique identifier of the product to subscribe to

​
proration_billing_mode
enum<string>
required

Proration Billing Mode

Available options:
prorated_immediately,
full_immediately,
difference_immediately
​
quantity
integer<int32>
required

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

Required range: x >= 0
​
addons
Attach Addon Request · object[] | null

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

​
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

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

Available options:
prevent_change,
apply_change

Response

Preview of subscription plan change

​
immediate_charge
object
required
​
new_plan
object
required

Response struct representing subscription details