# POST Create a font

Adds a font to the customiser, at the end of the current presentation order. Only `name` is required; every other field has a documented default (`line_height` null, `stencil_safe` false, every reference null). The created font has no typeface. Font-file uploads belong to the deferred file-upload surface, so this operation produces a row the storefront cannot render — `font_file.has_font_file` comes back false. Upload the typeface in the merchant admin to finish the font. Until that surface ships, the useful operations here are updating and reordering the fonts a customiser already has. A font is priced by the reference its customiser's pricing model needs: a `font_tier_id` on a customiser priced per sign size, a `length_pricing_id` on one priced by material length. Creating a font without it is refused with a 422, because the storefront cannot price the font. Every reference must name one of this customiser's own rows. Requires `customisers:write` and an `Idempotency-Key`. The write clears the customiser's cached storefront configuration and runs the advisory language sync. It never regenerates Shopify products, product images, or the product cache, so live listings are untouched. Option writes also spend one unit of a separate per-key option-write budget; exhausting it returns a 429 with `retry_after`.

- Source URL: https://www.signcustomiser.com/help/api/v3-post-create-a-font/
- Markdown URL: https://www.signcustomiser.com/help/api/v3-post-create-a-font.md
- Group: Customiser fonts
- Method: POST
- Path: /api/v3/customisers/{customiser_id}/fonts
- Auth: Bearer token
- Required scopes: `customisers:write`

## Path parameters

- customiser_id (string, required): The customiser id. Example: 1

## Body parameters

- name (string, optional): No description provided.
- line_height (number, optional): No description provided.
- stencil_safe (boolean, optional): No description provided.
- min_height_smallest_letter_cm (number, optional): No description provided.
- min_height_uppercase_letter_cm (integer, optional): No description provided.
- font_tier_id (integer, optional): No description provided.
- length_pricing_id (integer, optional): No description provided.
- minimum_size_id (integer, optional): No description provided.
- minimum_legacy_fixed_height_size_id (integer, optional): No description provided.

## Request body example

```json
{
  "name": "Neon Script",
  "line_height": 1.2,
  "stencil_safe": false,
  "min_height_smallest_letter_cm": 4.5,
  "min_height_uppercase_letter_cm": 6,
  "font_tier_id": 7,
  "length_pricing_id": 4,
  "minimum_size_id": 3,
  "minimum_legacy_fixed_height_size_id": 5
}
```

## cURL example

```bash
curl https://web.signcustomiser.com/api/v3/customisers/1/fonts \
  --request POST \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer YOUR_API_TOKEN' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "Neon Script",
  "line_height": 1.2,
  "stencil_safe": false,
  "min_height_smallest_letter_cm": 4.5,
  "min_height_uppercase_letter_cm": 6,
  "font_tier_id": 7,
  "length_pricing_id": 4,
  "minimum_size_id": 3,
  "minimum_legacy_fixed_height_size_id": 5
}'
```

## Response examples

### 201 POST 201 example 1

```json
{
  "data": {
    "object": "font",
    "id": 11,
    "customiser_id": 42,
    "name": "Neon Script",
    "line_height": null,
    "uses_default_line_height": true,
    "stencil_safe": false,
    "min_height_smallest_letter_cm": null,
    "min_height_uppercase_letter_cm": null,
    "font_tier_id": 7,
    "length_pricing_id": null,
    "minimum_size_id": null,
    "minimum_legacy_fixed_height_size_id": null,
    "sort_order": 1,
    "font_file": {
      "has_font_file": false,
      "family_name": null,
      "ttf_url": null
    },
    "created_at": "2026-08-13T00:00:00Z",
    "updated_at": "2026-08-13T00:00:00Z"
  },
  "links": {
    "self": "https://web.signcustomiser.com/api/v3/customisers/42/fonts/11",
    "documentation": "https://www.signcustomiser.com/help/api/"
  },
  "meta": {
    "api_version": "v3",
    "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
  }
}
```

### 400 Missing idempotency key

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/missing_idempotency_key",
  "title": "Missing idempotency key",
  "status": 400,
  "code": "missing_idempotency_key",
  "detail": "Provide an Idempotency-Key header for this write.",
  "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:write scope.",
  "required_scopes": [
    "customisers:write"
  ],
  "granted_scopes": [
    "customisers:read"
  ],
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 404 Unknown customiser

```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"
}
```

### 409 Idempotency conflict

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/idempotency_key_conflict",
  "title": "Idempotency key conflict",
  "status": 409,
  "code": "idempotency_key_conflict",
  "detail": "This Idempotency-Key was already used for a different request body on this operation.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 413 Request body too large

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/request_too_large",
  "title": "Request too large",
  "status": 413,
  "code": "request_too_large",
  "detail": "The request body must not exceed 2 MiB.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 422 Font pricing required

```json
{
  "type": "https://www.signcustomiser.com/help/api/problems/validation_failed",
  "title": "Validation failed",
  "status": 422,
  "code": "validation_failed",
  "detail": "This customiser prices fonts by font tier, so every font must name one.",
  "errors": [
    {
      "pointer": "/font_tier_id",
      "code": "font_pricing_required",
      "detail": "Name one of this customiser's font tiers so the storefront can price the font."
    }
  ],
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```

### 429 Option write budget exhausted

```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": 37,
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
```