# Create a promotion (/api/promotions/create-promotion)

`POST https://api.comecero.com/api/v1/promotions`

Creates a coupon, cross-sell or up-sell. A new promotion is inactive unless you send `active: true`. For a coupon with a `generator_prefix`, a `generator_secret_key` is made when you do not send one. Secret and trusted tokens may call it.

## Parameters

- `timezone` (query): An IANA time zone name, such as `America/New_York` or `UTC`. It sets how `date_start` and `date_end` are read and the time zone of every date in the response. The default is the account's time zone (Settings, Technical), or UTC when it has none. A name that is not known is a `400`.
- `show` (query): Comma-separated fields to return; all others are left out. Use dot notation for child fields (`customer.email`). You cannot send `show` and `hide` together (`400`). See [Customizing output](https://docs.comecero.com/docs/basic-concepts/customizing-output).
- `hide` (query): Comma-separated fields to leave out of the response. Use dot notation for child fields (`customer.email`). You cannot send `show` and `hide` together (`400`). See [Customizing output](https://docs.comecero.com/docs/basic-concepts/customizing-output).
- `formatted` (query): When `true`, the object also has a `formatted` child with amounts and dates as display text in the shopper's language and currency (for example `$19.99` or `November 7, 2026`). The default is `false`. See [Localized formatting](https://docs.comecero.com/docs/basic-concepts/localized-formatting).

Responses: 201, 400, 401, 403, 500.

Full schemas: operation `create_promotion` in /openapi.json.