Sign Customiser

Customiser backboards

Update a backboard

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Applies an RFC 7396 JSON Merge Patch to one backboard: properties omitted from the body are unchanged, and null clears a nullable property (description, backboard_type, outline_size, price_per_sq_cm). Arrays are replaced wholesale, so sending letter_type_ids replaces the whole assignment.

PATCH/api/v3/customisers/{customiser_id}/backboards/{backboard_id}

Overview

Read-only and unknown fields are rejected. An empty object {} is a valid no-op. Requires customisers:write. backboard_type may only become custom_shape or cutout on a backboard that already carries an uploaded shape, and custom_shape is additionally refused while the customiser has a border margin configured, because a shape owns its own proportions. Clear the border margins first. 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

backboard_idstringpathrequired

The backboard id.

Example: 11

Request body

namestringbody
descriptionstringbody
letter_type_idsarraybody
base_priceintegerbody
price_per_sq_cmnumberbody

Request body example

application/json
{
  "name": "Clear Acrylic Panel",
  "description": "A 5mm clear acrylic panel",
  "letter_type_ids": [
    3
  ],
  "base_price": 500,
  "price_per_sq_cm": 0.022
}
Update a backboard
curl https://web.signcustomiser.com/api/v3/customisers/1/backboards/11 \
  --request PATCH \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer YOUR_API_TOKEN' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "Clear Acrylic Panel",
  "description": "A 5mm clear acrylic panel",
  "letter_type_ids": [
    3
  ],
  "base_price": 500,
  "price_per_sq_cm": 0.022
}'
Response200
{
  "data": {
    "object": "backboard",
    "id": 11,
    "customiser_id": 42,
    "name": "Clear Acrylic Panel",
    "description": "A 5mm clear acrylic panel",
    "backboard_type": "board",
    "letter_type_ids": [
      3
    ],
    "outline_size": null,
    "allow_multilayer": false,
    "custom_background_enabled": false,
    "show_custom_background": false,
    "base_price": 500,
    "currency": "USD",
    "price_multiplier": 1,
    "price_multiplier_target": "base_letter_price",
    "price_per_sq_cm": 0.022,
    "sort_order": 1,
    "image_url": null,
    "button_image_url": null,
    "geometry": {
      "has_custom_shape": false,
      "status": null,
      "failure_reason": null,
      "measured_at": null
    },
    "created_at": "2026-08-13T00:00:00Z",
    "updated_at": "2026-08-13T00:05:00Z"
  },
  "links": {
    "self": "https://web.signcustomiser.com/api/v3/customisers/42/backboards/11",
    "documentation": "https://www.signcustomiser.com/help/api/"
  },
  "meta": {
    "api_version": "v3",
    "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
  }
}
Response400
{
  "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"
}
Response401
{
  "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"
}
Response403
{
  "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"
}
Response404
{
  "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"
}
Response409
{
  "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"
}
Response413
{
  "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"
}
Response422
{
  "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": "/geometry",
      "code": "prohibited",
      "detail": "The geometry field is prohibited."
    }
  ],
  "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
}
Response429
{
  "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"
}