Customiser extras

Update an extra

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Applies an RFC 7396 JSON Merge Patch to one extra: properties omitted from the body are unchanged, and null clears a nullable property. Arrays are replaced wholesale, so sending select_options replaces the whole list of choices and sending an exclusion list replaces the whole list.

PATCH/api/v3/customisers/{customiser_id}/extras/{extra_id}

Update an extra

Applies an RFC 7396 JSON Merge Patch to one extra: properties omitted from the body are unchanged, and `null` clears a nullable property. Arrays are replaced wholesale, so sending `select_options` replaces the whole list of choices and sending an exclusion list replaces the whole list. Read-only and unknown fields are rejected. An empty object `{}` is a valid no-op. Requires `customisers:write`. A choice keeps the images uploaded against it as long as its `value` stays the same, because image upload is a follow-up surface and a rename must not destroy a picture the API cannot restore. A choice with a new value starts without images. `input_type` may be changed. The fields the new type does not read are emptied in the same write, because the read projection publishes them as null and a row that disagreed with its projection would be unreachable from either surface. An `Idempotency-Key` is optional here: sending one makes the update safe to retry (an exact repeat replays the original response; the same key with a different body is a 409). The update clears the customiser's cached storefront configuration and runs the advisory language sync, and never regenerates Shopify products, product images, or the product cache.

Update an extra

Overview

Read-only and unknown fields are rejected. An empty object {} is a valid no-op. Requires customisers:write. A choice keeps the images uploaded against it as long as its value stays the same, because image upload is a follow-up surface and a rename must not destroy a picture the API cannot restore. A choice with a new value starts without images. input_type may be changed. The fields the new type does not read are emptied in the same write, because the read projection publishes them as null and a row that disagreed with its projection would be unreachable from either surface. An Idempotency-Key is optional here: sending one makes the update safe to retry (an exact repeat replays the original response; the same key with a different body is a 409). The update clears the customiser's cached storefront configuration and runs the advisory language sync, and never regenerates Shopify products, product images, or the product cache.

Authorisation

Bearer token required. Include it in theAuthorization header.

Required scope: customisers:write

Path parameters

customiser_idstringpathrequired

The customiser id.

Example: 1

extra_idstringpathrequired

The extra id.

Example: 9

Request body

namestringbody

descriptionstringbody

true_labelstringbody

default_valuebooleanbody

base_priceintegerbody

Request body example

{
  "name": "Dimmer",
  "description": "Adds a dimmer switch",
  "true_label": "Yes please",
  "default_value": true,
  "base_price": 500
}

Update an extra

curl https://web.signcustomiser.com/api/v3/customisers/1/extras/9 \
  --request PATCH \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer YOUR_API_TOKEN' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "Dimmer",
  "description": "Adds a dimmer switch",
  "true_label": "Yes please",
  "default_value": true,
  "base_price": 500
}'

{
  "data": {
    "object": "extra",
    "id": 9,
    "customiser_id": 42,
    "name": "Dimmer",
    "description": "Adds a dimmer switch",
    "input_type": "yes_no",
    "true_label": "Yes please",
    "false_label": "No",
    "default_value": true,
    "char_limit": null,
    "yes_colour_exclusions": [
      {
        "colour_id": 7,
        "letter_part": "face"
      }
    ],
    "no_colour_exclusions": [],
    "select_options": null,
    "image_url": null,
    "base_price": 500,
    "currency": "USD",
    "price_multiplier": 0,
    "price_multiplier_target": "base_letter_price",
    "sort_order": 1,
    "created_at": "2026-08-13T00:00:00Z",
    "updated_at": "2026-08-13T00:05:00Z"
  },
  "links": {
    "self": "https://web.signcustomiser.com/api/v3/customisers/42/extras/9",
    "documentation": "https://www.signcustomiser.com/help/api/"
  },
  "meta": {
    "api_version": "v3",
    "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
  }
}

{
  "type": "https://www.signcustomiser.com/help/api/problems/malformed_json",
  "title": "Malformed JSON",
  "status": 400,
  "code": "malformed_json",
  "detail": "The request body is not valid JSON: Syntax error.",
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}

{
  "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"
}

{
  "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"
}

{
  "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"
}

{
  "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"
}

{
  "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"
}

{
  "type": "https://www.signcustomiser.com/help/api/problems/validation_failed",
  "title": "Validation failed",
  "status": 422,
  "code": "validation_failed",
  "detail": "The request payload failed validation.",
  "errors": [
    {
      "pointer": "/sort_order",
      "code": "prohibited",
      "detail": "The sort_order field is prohibited."
    }
  ],
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}

{
  "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"
}