# POST /api/v1/inventory/products/variants

> Create product variant

- **Tag:** inventory:products
- **Operation ID:** `create_variant_api_v1_inventory_products_variants_post`

## Description

Create a new product variant. When the business has Stripe connected, the variant is mirrored to Stripe Catalog (Product + Price); otherwise the variant is created locally with empty Stripe IDs and can be synced later.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Request body

Schema: `VariantCreateRequest`

- `product_id` (string) — UUID of the parent product this variant belongs to.
- `unit_price` (integer) — Sale price in cents (e.g., 2999 = $29.99).
- `unit_cost` (integer) — Cost price in cents for margin calculations.
- `unit_cost_precise` (number) — Precise unit cost in dollars with sub-cent precision (e.g. 0.0478 for $0.0478/gram).
- `name` (string) — Variant name (e.g., 'Large - Blue').
- `sku` (string) — Stock Keeping Unit - unique identifier for inventory.
- `manufacturer_sku` (string) — Manufacturer's SKU for supplier ordering.
- `barcode` (string) — Scannable barcode (UPC/EAN/QR). Distinct from SKU.
- `uom` (string) — Unit of measure: EA, LB, G, KG, OZ, L, ML, etc.
- `default_vendor_id` (string) — UUID of the preferred vendor for this variant.
- `initial_inventory_quantity` (integer) — Starting inventory quantity.
- `initial_inventory_quantity_date` (string · date-time) — Date for the initial inventory count (ISO 8601).

## Responses

### 201 — Successful Response

Schema: `SuccessEnvelope_VariantResponse_`

- `success` (boolean)
- `message` (string)
- `code` (string)
- `data` (VariantResponse)

### 400 — Bad request - invalid data

### 404 — Business or product not found

### 409 — Variant with same SKU already exists

### 422 — Validation error

## Code samples

### cURL

```bash
curl -X POST 'https://api.ondayzero.com/api/v1/inventory/products/variants' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "product_id": "string",
  "unit_price": 0,
  "unit_cost": 0,
  "unit_cost_precise": 0,
  "name": "string",
  "sku": "string"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/inventory/products/variants', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "product_id": "string",
  "unit_price": 0,
  "unit_cost": 0,
  "unit_cost_precise": 0,
  "name": "string",
  "sku": "string"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {
  "product_id": "string",
  "unit_price": 0,
  "unit_cost": 0,
  "unit_cost_precise": 0,
  "name": "string",
  "sku": "string"
}

response = httpx.post("https://api.ondayzero.com/api/v1/inventory/products/variants", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/inventory-products/create-variant
- OpenAPI slice: https://www.ondayzero.com/docs/reference/inventory-products/create-variant/openapi.json
- Other endpoints in **inventory:products**: https://www.ondayzero.com/docs/reference/inventory-products