Errors - Genlook Documentation

Every /tryon/v1/* endpoint returns errors in the same JSON shape. Branch on code — it’s the stable contract. Treat message as human-readable text that may be polished between releases.

Error shape

{
  "code": "PRODUCT_NOT_FOUND",
  "message": "Product 'shirt-42' not found.",
  "status": 404
}

For validation failures (Zod rejections of the request body) the response also includes a details array with one entry per offending field:

Validation shape

{
  "code": "VALIDATION_FAILED",
  "message": "Request body failed validation. See `details` for per-field errors.",
  "status": 400,
  "details": [
    { "path": "product.images.0.url", "message": "Required" },
    { "path": "validForDays",        "message": "Expected number, received string" }
  ]
}

The HTTP status in the response always matches the status field. You can read either — both are part of the contract.

Codes

Codes are grouped by what triggered them. Branching on the code is enough — the same code always means the same thing across endpoints.

Auth

Code	Status	When you’ll see it
`MISSING_API_KEY`	401	`x-api-key` header is missing.
`INVALID_API_KEY`	401	The key was rejected — wrong, revoked, or inactive account.

Authorization

Code	Status	When you’ll see it
`FORBIDDEN`	403	Requested resource (product, generation) belongs to a different account.

Request validation (400)

Code	When you’ll see it
`VALIDATION_FAILED`	Zod rejected the request body. `details[]` lists `{ path, message }` for every offending field.
`EXTERNAL_ID_REQUIRED`	`POST /products` without `externalId`.
`PRODUCT_IMAGES_REQUIRED`	Creating or one-shotting a product without any image.
`CUSTOMER_IMAGE_REQUIRED`	`POST /try-on` without a `customer` object.
`FILE_REQUIRED`	`POST /images/upload` called with no `file` field.
`MULTIPART_FILE_NOT_FOUND`	A `fileKey` referenced from `data` doesn’t appear in the multipart payload.
`INVALID_IMAGE_INPUT`	An `images[]` entry has neither `url` nor `fileKey`.
`INVALID_IMAGE`	Uploaded bytes are too small to be an image, or otherwise malformed before format detection.
`UNSUPPORTED_IMAGE_TYPE`	The uploaded file isn’t JPEG, PNG, WebP, or HEIC.
`CUSTOMER_IMAGE_FETCH_FAILED`	`customer: { url }` could not be downloaded — DNS failed, host unreachable, or the URL returned a non-2xx status.
`PRODUCT_IMAGE_FETCH_FAILED`	A product image URL could not be downloaded during generation processing. Surfaces on `GET /generations/:id` as `errorCode` once the generation transitions to `FAILED`.

Unprocessable product

Code	Status	When you’ll see it
`MISSING_REQUIRED_CLASSIFICATION`	422	The engine selected for this product type requires a product image with a specific classification (e.g. pasties need an image classified `on_model`), and none of the product’s images qualifies. `details.key` names the missing classification. Add a suitable image or pass an override classification. Also surfaces on `GET /generations/:id` as `errorCode` when the check runs during processing.

Payload size

Code	Status	When you’ll see it
`FILE_TOO_LARGE`	413	Any single image attachment exceeds 10 MB (customer image or product image).

Billing

Code	Status	When you’ll see it
`INSUFFICIENT_CREDITS`	402	Account has 0 credits remaining. Top up and retry.
`QUOTA_EXCEEDED`	402	The account-level quota check rejected the call. Back off and retry — these are usually transient.

Rate limiting

Code	Status	When you’ll see it
`RATE_LIMITED`	429	Per-account request budget exceeded. Back off and retry. Burst limits are higher than steady-state — see your dashboard.

Not found

Code	Status	When you’ll see it
`PRODUCT_NOT_FOUND`	404	`GET`/`DELETE /products/:externalId`, or `POST /try-on` referencing a missing externalId, or stats endpoint with a bad id.
`GENERATION_NOT_FOUND`	404	`GET /generations/:id` for an id that doesn’t exist on the account.
`ACCOUNT_NOT_FOUND`	404	Account lookup failed (very rare — the API key check usually fails first).
`ROUTE_NOT_FOUND`	404	Request hit a path that doesn’t exist on `/tryon/v1/*`. For unknown routes the standard error shape may not apply.

Conflicts

Code	Status	When you’ll see it
`RESERVED_EXTERNAL_ID`	409	`POST /products` with an `externalId` starting with `_anon_`. That prefix is reserved for server-generated IDs.

Server

Code	Status	When you’ll see it
`INTERNAL_ERROR`	500	Unexpected failure on our side. Safe to retry with exponential backoff. Contact support if it recurs.
`GENERATION_FAILED`	500	The generation pipeline failed mid-way (model unavailable, upstream timeout, or another internal hiccup). Surfaces on `GET /generations/:id` once the generation transitions to `FAILED`. Safe to retry.

Handling errors in code

Switch on code and let the message bubble up to your logs/UI for debugging. Don’t parse message — it’s polished text, not a stable identifier.

import requests

r = requests.post(f"{BASE}/tryon/v1/try-on", headers=HDR, json=payload)
if not r.ok:
    err = r.json()
    code = err.get("code")
    if code == "INSUFFICIENT_CREDITS":
        notify_billing(err["message"])
    elif code == "PRODUCT_NOT_FOUND":
        log_missing_product(payload["product"]["externalId"])
    elif code == "VALIDATION_FAILED":
        # err["details"] = [{ "path": "...", "message": "..." }, ...]
        log_validation_issues(err["details"])
    else:
        log_unexpected(err)
    r.raise_for_status()

Retry guidance

Code	Retry?	Notes
`MISSING_API_KEY`	No	Fix the request.
`INVALID_API_KEY`	No	Re-issue the key from the dashboard if it was rotated.
`VALIDATION_FAILED`	No	Fix the offending fields listed in `details`.
`PRODUCT_NOT_FOUND`	No	Inline-upsert the product (send a full payload on the next call), or store it via `POST /products`.
`GENERATION_NOT_FOUND`	No	The id is wrong or belongs to a different account.
`CUSTOMER_IMAGE_FETCH_FAILED`	Sometimes	Retry once if it might be transient; otherwise fix the source URL.
`PRODUCT_IMAGE_FETCH_FAILED`	Sometimes	Surfaces on `GET /generations/:id`. Retry once for transient hiccups; otherwise fix the product image URL.
`FILE_TOO_LARGE`	No	Resize/compress before resending.
`MISSING_REQUIRED_CLASSIFICATION`	No	Add a product image that satisfies the classification named in `details.key`, or pass an override classification.
`INSUFFICIENT_CREDITS`	After top-up	Top up from the Genlook dashboard.
`QUOTA_EXCEEDED`	Yes (back off)	Usually transient. Exponential backoff.
`RATE_LIMITED`	Yes (back off)	Honour `Retry-After` if present; otherwise exponential backoff.
`INTERNAL_ERROR`	Yes (back off, ≤3×)	Exponential backoff. Contact support if it persists.
`GENERATION_FAILED`	Yes (back off, ≤3×)	Surfaces on `GET /generations/:id`. Usually transient — retry the request. Contact support if it persists.

​Codes

​Auth

​Authorization

​Request validation (400)

​Unprocessable product

​Payload size

​Billing

​Rate limiting

​Not found

​Conflicts

​Server

​Handling errors in code

​Retry guidance

Codes

Auth

Authorization

Request validation (400)

Unprocessable product

Payload size

Billing

Rate limiting

Not found

Conflicts

Server

Handling errors in code

Retry guidance