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cfw-autumn/apps/docs/mintlify/api-reference/billing/previewMultiAttach.mdx
2026-02-26 10:40:45 +00:00

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---
title: "Preview Multi Attach"
openapi: "openapi POST /v1/billing.preview_multi_attach"
---
import { DynamicParamField } from "/components/dynamic-param-field.jsx";
import { DynamicResponseField } from "/components/dynamic-response-field.jsx";
import { DynamicResponseExample } from "/components/dynamic-response-example.jsx";
### Body Parameters
<DynamicParamField body="customer_id" type="string" required>
The ID of the customer to attach the plans to.
</DynamicParamField>
<DynamicParamField body="entity_id" type="string">
The ID of the entity to attach the plans to.
</DynamicParamField>
<DynamicParamField body="plans" type="object[]" required>
The list of plans to attach to the customer.
<Expandable title="properties">
<DynamicParamField body="plan_id" type="string" required>
The ID of the plan to attach.
</DynamicParamField>
<DynamicParamField body="customize" type="object">
Customize the plan to attach. Can override the price or items.
<Expandable title="properties">
<DynamicParamField body="price" type="object | null">
Base price configuration for a plan.
<Expandable title="properties">
<DynamicParamField body="amount" type="number" required>
Base price amount for the plan.
</DynamicParamField>
<DynamicParamField body="interval" type="'one_off' | 'week' | 'month' | 'quarter' | 'semi_annual' | 'year'" required>
Billing interval (e.g. 'month', 'year').
</DynamicParamField>
<DynamicParamField body="interval_count" type="number">
Number of intervals per billing cycle. Defaults to 1.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="items" type="object[]">
Override the items in the plan.
<Expandable title="properties">
<DynamicParamField body="feature_id" type="string" required>
The ID of the feature to configure.
</DynamicParamField>
<DynamicParamField body="included" type="number">
Number of free units included. Balance resets to this each interval for consumable features.
</DynamicParamField>
<DynamicParamField body="unlimited" type="boolean">
If true, customer has unlimited access to this feature.
</DynamicParamField>
<DynamicParamField body="reset" type="object">
Reset configuration for consumable features. Omit for non-consumable features like seats.
<Expandable title="properties">
<DynamicParamField body="interval" type="'one_off' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'semi_annual' | 'year'" required>
Interval at which balance resets (e.g. 'month', 'year'). For consumable features only.
</DynamicParamField>
<DynamicParamField body="interval_count" type="number">
Number of intervals between resets. Defaults to 1.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="price" type="object">
Pricing for usage beyond included units. Omit for free features.
<Expandable title="properties">
<DynamicParamField body="amount" type="number">
Price per billing_units after included usage. Either 'amount' or 'tiers' is required.
</DynamicParamField>
<DynamicParamField body="tiers" type="object[]">
Tiered pricing. Either 'amount' or 'tiers' is required.
<Expandable title="properties">
<DynamicParamField body="to" type="number" required />
<DynamicParamField body="amount" type="number" required />
<DynamicParamField body="flat_amount" type="number | null" />
</Expandable>
</DynamicParamField>
<DynamicParamField body="tier_behavior" type="'graduated' | 'volume'" />
<DynamicParamField body="interval" type="'one_off' | 'week' | 'month' | 'quarter' | 'semi_annual' | 'year'" required>
Billing interval. For consumable features, should match reset.interval.
</DynamicParamField>
<DynamicParamField body="interval_count" type="number">
Number of intervals per billing cycle. Defaults to 1.
</DynamicParamField>
<DynamicParamField body="billing_units" type="number">
Units per price increment. Usage is rounded UP when billed (e.g. billing_units=100 means 101 rounds to 200).
</DynamicParamField>
<DynamicParamField body="billing_method" type="'prepaid' | 'usage_based'" required>
'prepaid' for upfront payment (seats), 'usage_based' for pay-as-you-go.
</DynamicParamField>
<DynamicParamField body="max_purchase" type="number">
Max units purchasable beyond included. E.g. included=100, max_purchase=300 allows 400 total.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="proration" type="object">
Proration settings for prepaid features. Controls mid-cycle quantity change billing.
<Expandable title="properties">
<DynamicParamField body="on_increase" type="'bill_immediately' | 'prorate_immediately' | 'prorate_next_cycle' | 'bill_next_cycle'" required>
Billing behavior when quantity increases mid-cycle.
</DynamicParamField>
<DynamicParamField body="on_decrease" type="'prorate' | 'prorate_immediately' | 'prorate_next_cycle' | 'none' | 'no_prorations'" required>
Credit behavior when quantity decreases mid-cycle.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="rollover" type="object">
Rollover config for unused units. If set, unused included units carry over.
<Expandable title="properties">
<DynamicParamField body="max" type="number">
Max rollover units. Omit for unlimited rollover.
</DynamicParamField>
<DynamicParamField body="expiry_duration_type" type="'month' | 'forever'" required>
When rolled over units expire.
</DynamicParamField>
<DynamicParamField body="expiry_duration_length" type="number">
Number of periods before expiry.
</DynamicParamField>
</Expandable>
</DynamicParamField>
</Expandable>
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="feature_quantities" type="object[]">
If this plan contains prepaid features, use this field to specify the quantity of each prepaid feature.
<Expandable title="properties">
<DynamicParamField body="feature_id" type="string" required>
The ID of the feature to set quantity for.
</DynamicParamField>
<DynamicParamField body="quantity" type="number">
The quantity of the feature.
</DynamicParamField>
<DynamicParamField body="adjustable" type="boolean">
Whether the customer can adjust the quantity.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="version" type="number">
The version of the plan to attach.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="free_trial" type="object | null">
Free trial configuration for a plan.
<Expandable title="properties">
<DynamicParamField body="duration_length" type="number" required>
Number of duration_type periods the trial lasts.
</DynamicParamField>
<DynamicParamField body="duration_type" type="'day' | 'month' | 'year'">
Unit of time for the trial ('day', 'month', 'year').
</DynamicParamField>
<DynamicParamField body="card_required" type="boolean">
If true, payment method required to start trial. Customer is charged after trial ends.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="invoice_mode" type="object">
Invoice mode creates a draft or open invoice and sends it to the customer, instead of charging their card immediately.
<Expandable title="properties">
<DynamicParamField body="enabled" type="boolean" required>
When true, creates an invoice and sends it to the customer instead of charging their card immediately. Uses Stripe's send_invoice collection method.
</DynamicParamField>
<DynamicParamField body="enable_plan_immediately" type="boolean">
If true, enables the plan immediately even though the invoice is not paid yet.
</DynamicParamField>
<DynamicParamField body="finalize" type="boolean">
If true, finalizes the invoice so it can be sent to the customer. If false, keeps it as a draft for manual review.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="discounts" type="object[]">
List of discounts to apply. Each discount can be an Autumn reward ID, Stripe coupon ID, or Stripe promotion code.
<Expandable title="properties">
<DynamicParamField body="reward_id" type="string">
The ID of the reward to apply as a discount.
</DynamicParamField>
<DynamicParamField body="promotion_code" type="string">
The promotion code to apply as a discount.
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="success_url" type="string">
URL to redirect to after successful checkout.
</DynamicParamField>
<DynamicParamField body="checkout_session_params" type="object">
Additional parameters to pass into the creation of the Stripe checkout session.
</DynamicParamField>
<DynamicParamField body="redirect_mode" type="'always' | 'if_required' | 'never'">
Controls when to return a checkout URL. 'always' returns a URL even if payment succeeds, 'if_required' only when payment action is needed, 'never' disables redirects.
</DynamicParamField>
<DynamicParamField body="new_billing_subscription" type="boolean">
Only applicable when the customer has an existing Stripe subscription. If true, creates a new separate subscription instead of merging into the existing one.
</DynamicParamField>
<DynamicParamField body="customer_data" type="object">
Customer details to set when creating a customer
<Expandable title="properties">
<DynamicParamField body="name" type="string | null">
Customer's name
</DynamicParamField>
<DynamicParamField body="email" type="string | null">
Customer's email address
</DynamicParamField>
<DynamicParamField body="fingerprint" type="string | null">
Unique identifier (eg, serial number) to detect duplicate customers and prevent free trial abuse
</DynamicParamField>
<DynamicParamField body="metadata" type="object | null">
Additional metadata for the customer
</DynamicParamField>
<DynamicParamField body="stripe_id" type="string | null">
Stripe customer ID if you already have one
</DynamicParamField>
<DynamicParamField body="create_in_stripe" type="boolean">
Whether to create the customer in Stripe
</DynamicParamField>
<DynamicParamField body="auto_enable_plan_id" type="string">
The ID of the free plan to auto-enable for the customer
</DynamicParamField>
<DynamicParamField body="send_email_receipts" type="boolean">
Whether to send email receipts to this customer
</DynamicParamField>
</Expandable>
</DynamicParamField>
<DynamicParamField body="entity_data" type="object">
<Expandable title="properties">
<DynamicParamField body="feature_id" type="string" required>
The feature ID that this entity is associated with
</DynamicParamField>
<DynamicParamField body="name" type="string">
Name of the entity
</DynamicParamField>
</Expandable>
</DynamicParamField>
### Response
<DynamicResponseField name="customer_id" type="string">
The ID of the customer.
</DynamicResponseField>
<DynamicResponseField name="line_items" type="object[]">
List of line items for the current billing period.
<Expandable title="properties">
<DynamicResponseField name="title" type="string">
The title of the line item.
</DynamicResponseField>
<DynamicResponseField name="description" type="string">
A detailed description of the line item.
</DynamicResponseField>
<DynamicResponseField name="amount" type="number">
The amount in cents for this line item.
</DynamicResponseField>
<DynamicResponseField name="discounts" type="object[]">
List of discounts applied to this line item.
<Expandable title="properties">
<DynamicResponseField name="amountOff" type="number" />
<DynamicResponseField name="percentOff" type="number" />
<DynamicResponseField name="stripeCouponId" type="string" />
<DynamicResponseField name="couponName" type="string" />
</Expandable>
</DynamicResponseField>
</Expandable>
</DynamicResponseField>
<DynamicResponseField name="total" type="number">
The total amount in cents for the current billing period.
</DynamicResponseField>
<DynamicResponseField name="currency" type="string">
The three-letter ISO currency code (e.g., 'usd').
</DynamicResponseField>
<DynamicResponseField name="next_cycle" type="object">
Preview of the next billing cycle, if applicable. This shows what the customer will be charged in subsequent cycles.
<Expandable title="properties">
<DynamicResponseField name="starts_at" type="number">
Unix timestamp (milliseconds) when the next billing cycle starts.
</DynamicResponseField>
<DynamicResponseField name="total" type="number">
The total amount in cents for the next cycle.
</DynamicResponseField>
</Expandable>
</DynamicResponseField>
<ResponseExample>
```json 200
{
"customerId": "charles",
"lineItems": [
{
"title": "Pro seed",
"description": "Pro seed - Base Price (from 18 Feb 2026 to 18 Mar 2026)",
"amount": 20,
"discounts": []
}
],
"total": 20,
"currency": "usd"
}
```
</ResponseExample>