Customiser letter parts

Delete a letter part default upload image

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Clears the letter part's default_upload_image slot and deletes the stored file, returning a receipt naming what was removed and the letter part as it now stands. Requires customisers:write and an Idempotency-Key.

DELETE/api/v3/customisers/{customiser_id}/letter-types/{letter_type_id}/letter-parts/{letter_part}/images/{image_slot}

Delete a letter part default upload image

Clears the letter part's `default_upload_image` slot and deletes the stored file, returning a receipt naming what was removed and the letter part as it now stands. Requires `customisers:write` and an `Idempotency-Key`. Deleting from a slot that holds no image answers 404. This is also how a part that carries the image becomes deletable: a declared part holding a default upload image refuses its own delete with `file_bearing`, and clearing the slot here releases that. The delete clears the customiser's cached storefront configuration and runs the advisory language sync, and never regenerates Shopify products, product images, or the product cache.

Delete a letter part default upload image

Overview

Deleting from a slot that holds no image answers 404. This is also how a part that carries the image becomes deletable: a declared part holding a default upload image refuses its own delete with file_bearing, and clearing the slot here releases that. The delete 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 the Authorization header.

Required scope: customisers:write

Path parameters

customiser_idstringpathrequired

The customiser id.

Example: 1

letter_type_idstringpathrequired

The letter type id.

Example: 7

letter_partstringpathrequired

The letter part.

Example: face

image_slotstringpathrequired

Which image to remove: default_upload_image.

Example: default_upload_image

Delete a letter part default upload image

curl https://web.signcustomiser.com/api/v3/customisers/1/letter-types/7/letter-parts/face/images/default_upload_image \
  --request DELETE \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer YOUR_API_TOKEN'

{
  "data": {
    "object": "file_deletion_receipt",
    "slot": "default_upload_image",
    "customiser_id": 42,
    "letter_type_id": 7,
    "letter_part": "face",
    "deleted": true,
    "removed_file": {
      "filename": "face-artwork.png",
      "url": "https://cdn.example.com/files/2f1c9c0e-6a7b-4c1d-8e2f-3a4b5c6d7e8f.png"
    },
    "resource": {
      "object": "letter_part_colour_selection",
      "customiser_id": 42,
      "letter_type_id": 7,
      "letter_part": "face",
      "name": null,
      "description": null,
      "optional": null,
      "optional_label": null,
      "optional_default_none": false,
      "lightsource": false,
      "custom_image": false,
      "show_default_upload_image": true,
      "show_in_text_editor": true,
      "text_enabled": false,
      "default_upload_image_url": 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/letter-types/7/letter-parts/face/images/default_upload_image",
    "documentation": "https://www.signcustomiser.com/help/api/"
  },
  "meta": {
    "api_version": "v3",
    "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t"
  }
}

{
  "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"
}

{
  "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/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"
}