---
title: "Get add-on association for subscription"
method: GET
path: "/openmeter/subscriptions/{subscriptionId}/addons/{subscriptionAddonId}"
tags: ["OpenMeter Subscriptions"]
---

# Get add-on association for subscription

`GET /openmeter/subscriptions/{subscriptionId}/addons/{subscriptionAddonId}`

Get an add-on association for a subscription.

## Path parameters

- `subscriptionId` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).
- `subscriptionAddonId` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).

## Response `200`

SubscriptionAddon response.

- SubscriptionAddon — Addon purchased with a subscription.
  - `id` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).
  - `labels` Labels — Labels store metadata of an entity that can be used for filtering an entity list or for searching across entity types. Keys must be of length 1-63 characters, and cannot start with "kong", "konnect", "mesh", "kic", or "_".
  - `created_at` string, date-time, required — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `updated_at` string, date-time, required — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `deleted_at` string, date-time — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `name` string, required — Display name of the resource. Between 1 and 256 characters.
  - `description` string — Optional description of the resource. Maximum 1024 characters.
  - `addon` AddonReference, required — Addon reference.
    - `id` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).
  - `quantity` integer, required — The quantity of the add-on. Always 1 for single instance add-ons.
  - `quantity_at` string, date-time, required — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `active_from` string, date-time, required — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `active_to` string, date-time — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
  - `timeline` SubscriptionAddonTimelineSegment[], required — The timeline of the add-on. The returned periods are sorted and continuous.
    - `active_from` string, date-time, required — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
    - `active_to` string, date-time — [RFC3339](https://tools.ietf.org/html/rfc3339) formatted date-time string in UTC.
    - `quantity` integer, required — The quantity of the add-on for the given period.
  - `rate_cards` SubscriptionAddonRateCard[], required — The rate cards of the add-on.
    - `rate_card` BillingRateCard, required — A rate card defines the pricing and entitlement of a feature or service.
      - `name` string, required — Display name of the resource. Between 1 and 256 characters.
      - `description` string — Optional description of the resource. Maximum 1024 characters.
      - `labels` Labels — Labels store metadata of an entity that can be used for filtering an entity list or for searching across entity types. Keys must be of length 1-63 characters, and cannot start with "kong", "konnect", "mesh", "kic", or "_".
      - `key` string, required — A key is a unique string that is used to identify a resource.
      - `feature` FeatureReference — Feature reference.
        - `id` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).
      - `currency` union — Fiat or custom currency code.
        - string — Three-letter [ISO4217](https://www.iso.org/iso-4217-currency-codes.html) currency code. Custom three-letter currency codes are also supported for convenience.
        - string — Custom currency code. It should be a unique code but not conflicting with any existing fiat currency codes.
      - `billing_cadence` string, ISO8601 — [ISO 8601 Duration](https://docs.digi.com/resources/documentation/digidocs/90001488-13/reference/r_iso_8601_duration_format.htm) string.
      - `price` union, required — Price.
        - object — Free price.
          - `type` 'free', required — The type of the price.
        - object — Flat price.
          - `type` 'flat', required — The type of the price.
          - `amount` string, required — Numeric represents an arbitrary precision number.
        - object — Unit price. Charges a fixed rate per billing unit. When UnitConfig is present on the rate card, billing units are the converted quantities (e.g. GB instead of bytes).
          - `type` 'unit', required — The type of the price.
          - `amount` string, required — Numeric represents an arbitrary precision number.
        - object — Graduated tiered price. Each tier's rate applies only to the usage within that tier. Pricing can change as cumulative usage crosses tier boundaries. When UnitConfig is present on the rate card, tier boundaries (up_to_amount) are expressed in converted billing units.
          - `type` 'graduated', required — The type of the price.
          - `tiers` BillingPriceTier[], required — The tiers of the graduated price. At least one tier is required.
            - `up_to_amount` string — Numeric represents an arbitrary precision number.
            - `flat_price` BillingPriceFlat — Flat price.
              - …
            - `unit_price` BillingPriceUnit — Unit price. Charges a fixed rate per billing unit. When UnitConfig is present on the rate card, billing units are the converted quantities (e.g. GB instead of bytes).
              - …
        - object — Volume tiered price. The maximum quantity within a period determines the per-unit price for all units in that period. When UnitConfig is present on the rate card, tier boundaries (up_to_amount) are expressed in converted billing units.
          - `type` 'volume', required — The type of the price.
          - `tiers` BillingPriceTier[], required — The tiers of the volume price. At least one tier is required.
            - `up_to_amount` string — Numeric represents an arbitrary precision number.
            - `flat_price` BillingPriceFlat — Flat price.
              - …
            - `unit_price` BillingPriceUnit — Unit price. Charges a fixed rate per billing unit. When UnitConfig is present on the rate card, billing units are the converted quantities (e.g. GB instead of bytes).
              - …
      - `unit_config` BillingUnitConfig — Unit conversion configuration. Transforms raw metered quantities into billing-ready units before pricing and entitlement evaluation. Applied at the rate card level so the same feature can be billed in different units across plans. Examples: - Meter bytes, bill GB: operation=divide, conversionFactor=1e9, rounding=ceiling, displayUnit="GB" - Meter seconds, bill hours: operation=divide, conversionFactor=3600, rounding=ceiling, displayUnit="hours" - Cost + 20% margin: operation=multiply, conversionFactor=1.2 - Bill per million tokens: operation=divide, conversionFactor=1e6, rounding=ceiling, displayUnit="M" v1 equivalents: - DynamicPrice(multiplier): operation=multiply, conversionFactor=multiplier + UnitPrice(amount=1) - PackagePrice(amount, quantityPerPkg): operation=divide, conversionFactor=quantityPerPkg, rounding=ceiling + UnitPrice(amount)
        - `operation` 'divide' | 'multiply', required — The arithmetic operation used to convert raw metered units into billing units. - `divide`: Divide the metered quantity by the conversion factor (e.g., bytes ÷ 1e9 = GB). - `multiply`: Multiply the metered quantity by the conversion factor (e.g., cost × 1.2 = cost + 20% margin).
        - `conversion_factor` string, required — Numeric represents an arbitrary precision number.
        - `rounding` 'ceiling' | 'floor' | 'half_up' | 'none' — The rounding mode applied to the converted quantity for invoicing. Rounding is applied only to the invoiced quantity. Entitlement balance checks use the precise decimal value after conversion. - `ceiling`: Round up to the next integer (typical for package-style billing). - `floor`: Round down to the previous integer. - `half_up`: Round to the nearest integer, with 0.5 rounding up. - `none`: No rounding; the converted value is used as-is.
        - `precision` integer — The number of decimal places to retain after rounding. Only meaningful when rounding is not "none". Defaults to 0 (round to whole numbers).
        - `display_unit` string — A human-readable label for the converted unit shown on invoices and in the customer portal (e.g., "GB", "hours", "M tokens"). Optional. When omitted, no unit label is rendered.
      - `payment_term` 'in_advance' | 'in_arrears' — The payment term of a flat price.
      - `commitments` BillingSpendCommitments — Spend commitments for a rate card. The customer is committed to spend at least the minimum amount and at most the maximum amount.
        - `minimum_amount` string — Numeric represents an arbitrary precision number.
        - `maximum_amount` string — Numeric represents an arbitrary precision number.
      - `discounts` BillingRateCardDiscounts — Discount configuration for a rate card.
        - `percentage` number — Percentage discount applied to the price (0–100).
        - `usage` string — Numeric represents an arbitrary precision number.
      - `tax_config` BillingRateCardTaxConfig — The tax config of the rate card.
        - `behavior` 'inclusive' | 'exclusive' — Tax behavior. This enum is used to specify whether tax is included in the price or excluded from the price.
        - `code` TaxCodeReference, required — TaxCode reference.
          - `id` string, required — ULID (Universally Unique Lexicographically Sortable Identifier).
      - `entitlement` union — Entitlement template configured on a rate card. The feature is taken from the rate card itself, so it is omitted here.
        - object — The entitlement template of a metered entitlement.
          - `type` 'metered', required — The type of the entitlement template.
          - `is_soft_limit` boolean — If soft limit is true, the subject can use the feature even if the entitlement is exhausted; access remains granted.
          - `limit` number, double — The amount of usage granted each usage period, in the feature's unit. Usage is counted against this allowance and the balance resets every usage period. When `is_soft_limit` is true the subject keeps access after the limit is reached; otherwise access is denied once the allowance is exhausted.
          - `usage_period` string, ISO8601 — [ISO 8601 Duration](https://docs.digi.com/resources/documentation/digidocs/90001488-13/reference/r_iso_8601_duration_format.htm) string.
        - object — The entitlement template of a static entitlement.
          - `type` 'static', required — The type of the entitlement template.
          - `config` unknown, required
        - object — The entitlement template of a boolean entitlement.
          - `type` 'boolean', required — The type of the entitlement template.
    - `affected_subscription_item_ids` ULID[], required — The IDs of the subscription items that this rate card belongs to.

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `403` — Forbidden
- `404` — Not Found

---

[API](https://skmtc.net/openmeterio/apis/openmeter-and-konnect-metering-billing-api.md) · [All operations](https://skmtc.net/openmeterio/apis/openmeter-and-konnect-metering-billing-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/openmeterio/openmeter-and-konnect-metering-billing-api/versions/9bca44e2d61d/schema)