# GET Get a size

Returns one of the customiser's sizes. Requires `customisers:read` and is safe to retry. A size belonging to another customiser or another store is indistinguishable from an unknown id, and legacy fixed-height sizes are a separate resource with their own id sequence — an id from one never resolves on the other.

- Source URL: https://www.signcustomiser.com/help/api/v3-get-get-a-size/
- Markdown URL: https://www.signcustomiser.com/help/api/v3-get-get-a-size.md
- Group: Customiser sizes
- Method: GET
- Path: /api/v3/customisers/{customiser_id}/sizes/{size_id}
- Auth: Bearer token
- Required scopes: `customisers:read`

## Path parameters

- customiser_id (string, required): The customiser id. Example: 1
- size_id (string, required): The size id, from the list sizes operation. Example: 1

## cURL example

```bash
curl https://web.signcustomiser.com/api/v3/customisers/1/sizes/1 \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer YOUR_API_TOKEN'
```

## Response examples

### 200 GET 200 example 1

```json
{
  "data": {
    "object": "size",
    "id": 7,
    "customiser_id": 42,
    "name": "Small",
    "description": null,
    "char_limit": 12,
    "line_limit": 1,
    "min_char": 1,
    "width_cm": 40,
    "height_cm": null,
    "line_height_cm": 10,
    "length_cm": null,
    "width_multiplier": null,
    "sizing_strategy": "fixed_width",
    "height_measurement_mode": "line_height",
    "border_margin_cm": null,
    "sort_order": 1,
    "created_at": "2026-08-13T00:00:00Z",
    "updated_at": "2026-08-13T00:00:00Z"
  },
  "links": {
    "self": "https://web.signcustomiser.com/api/v3/customisers/42/sizes/7",
    "documentation": "https://www.signcustomiser.com/help/api/"
  },
  "meta": {
    "api_version": "v3",
    "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
  }
}
```

### 401 Missing API key

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/missing_api_key",
  "title": "Missing API key",
  "status": 401,
  "code": "missing_api_key",
  "detail": "Provide a store API key as a bearer token.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 403 Insufficient scope

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/insufficient_scope",
  "title": "Insufficient scope",
  "status": 403,
  "code": "insufficient_scope",
  "detail": "This operation requires the customisers:read scope.",
  "required_scopes": [
    "customisers:read"
  ],
  "granted_scopes": [
    "store:read"
  ],
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 404 Unknown size

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/resource_not_found",
  "title": "Resource not found",
  "status": 404,
  "code": "resource_not_found",
  "detail": "The requested resource does not exist or does not belong to the authenticated store.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 422 Unknown parameter

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/unknown_parameter",
  "title": "Unknown query parameter",
  "status": 422,
  "code": "unknown_parameter",
  "detail": "This endpoint accepts no query parameters.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 429 Rate limited

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/rate_limited",
  "title": "Too many requests",
  "status": 429,
  "code": "rate_limited",
  "detail": "You have exceeded the request limit for this API key.",
  "retry_after": 60,
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```