---
title: "Platform: add a Direct Debit add-on for a business and create its GoCardless mandate link"
method: POST
path: "/api/v1/platform/businesses/{id}/addons"
---

# Platform: add a Direct Debit add-on for a business and create its GoCardless mandate link

`POST /api/v1/platform/businesses/{id}/addons`

## Request

- Base URL: `http://127.0.0.1:4310`
- URL: `http://127.0.0.1:4310/api/v1/platform/businesses/{id}/addons`
- Auth: one of:
  - HTTP bearer
  - API key in cookie `sfb_session`

## Path parameters

- `id` string, required

## Request body

- object
  - `reason` string, required
  - `if_version` integer, required
  - `idempotency_key` string, required
  - `addon_id` string, required: Catalogue id, for example voice_agent
  - `net_minor` integer: Price before VAT in pence (default from the catalogue)

## Response `200`

OK

- object

## Other responses

- `400`: Validation error
- `401`: Unauthenticated
- `403`: Forbidden
- `404`: Not found
- `409`: Conflict or invalid state

---

[API](https://skmtc.dev/scalingfirm/apis/tsf-booking-api.md) · [All operations](https://skmtc.dev/scalingfirm/apis/tsf-booking-api/llms.txt) · [OpenAPI document](https://skmtc.dev/scalingfirm/apis/tsf-booking-api/revisions/81704199cd37?raw)