---
title: Subscription addons
description: Manage addon services and features for active subscriptions
---

A subscription addon is an extra service or feature on an active telecom subscription. With
an addon a customer adds an allowance, a premium feature, or another service to what they
already have.

## Addon entity

A subscription addon in the API represents:

- **Supplementary service**: Additional feature or allowance attached to a base subscription
- **Independent configuration**: You add, change, and remove an addon without touching the base subscription.
- **Independent billing**: Separate pricing and billing cycles for addon services
- **Lifecycle management**: Addon activation, modifications, and cancellation workflows

## Key capabilities

- **Addon management** — Add, modify, and remove supplementary services from active subscriptions.
- **Product changes** — Change addon product offerings to upgrade or downgrade service features.
- **Availability check** — View available addon options compatible with specific subscriptions.
- **Status tracking** — Monitor addon status, activation dates, and service availability.

## Common use cases

- **Service enhancement** — Allow customers to enhance their subscriptions with additional features and allowances.
- **Temporary coverage** — Add temporary services like travel roaming packages for specific periods.
- **Upgrades and downgrades** — Enable gradual service upgrades without changing the base subscription plan.
- **Targeted features** — Provide specialized features for specific customer needs and use cases.

## Related resources

Subscription addons integrate with other API resources:

- **Subscriptions**: Base subscriptions to which addons are attached
- **Product offerings**: Addon product definitions with pricing and features
- **Orders**: Addon purchases and provisioning workflows
- **Invoices**: Addon charges included in subscription billing
- **Payments**: Payment collection for addon services

## Next steps

- [List active addons](/api-reference/subscription-addons.md#tag/subscription-addons/GET/subscriptions/{subscriptionId}/addons) — View all addons attached to a subscription
- [Add addon](/api-reference/subscription-addons.md#tag/subscription-addons/POST/subscriptions/{subscriptionId}/addons) — Attach a new addon to a subscription
- [Cancel addon](/api-reference/subscription-addons.md#tag/subscription-addons/POST/subscriptions/{subscriptionId}/addons/cancel) — Remove an addon from a subscription