> ## Documentation Index > Fetch the complete documentation index at: https://docs.closient.com/llms.txt > Use this file to discover all available pages before exploring further. # Quickstart > Get up and running with the Closient API in under 5 minutes. ## 1. Create an Account Sign up at [closient.com/accounts/signup](https://www.closient.com/accounts/signup/) to create your free account. You'll land in your Dashboard where you can create an organization and generate API keys. ## 2. Generate an API Key Navigate to **Settings > API Keys** in your [Dashboard](https://www.closient.com/dashboard/) and create a new key. Keys follow the format: ``` __ ``` | Prefix | Type | Use Case | | ------ | ----------- | --------------------------------------------------------- | | `csb` | Business | Server-side API access (full permissions) | | `csu` | User | User-scoped API access | | `cpk` | Publishable | Client-side embeds and widgets (rate-limited, org-scoped) | The body is 32 random characters and the checksum is a CRC-32 hex digest for format validation. API keys are shown once at creation time. They're stored as SHA-256 hashes and cannot be retrieved — only revoked and replaced. ## 3. Look Up a Product by GTIN ```bash cURL theme={null} curl -H "X-API-Key: YOUR_API_KEY" \ https://www.closient.com/products/api/v1/products?gtin=00012345678905 ``` ```python Python theme={null} import requests response = requests.get( "https://www.closient.com/products/api/v1/products", params={"gtin": "00012345678905"}, headers={"X-API-Key": "YOUR_API_KEY"}, ) product = response.json() ``` GTINs are always normalized to GTIN-14 (zero-padded). You can pass GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN), or GTIN-14 — the API handles normalization. ## 4. Resolve a GS1 Digital Link Any GTIN can be resolved via a GS1 Digital Link URI: ```bash JSON response theme={null} curl -H "Accept: application/json" \ https://www.closient.com/01/00012345678905 ``` ```bash GS1 Linkset theme={null} curl -H "Accept: application/linkset+json" \ https://www.closient.com/01/00012345678905 ``` ```bash With batch and serial theme={null} curl -H "Accept: application/json" \ https://www.closient.com/01/00012345678905/10/BATCH123/21/SERIAL001 ``` ## 5. Understand the Response Envelope All list endpoints return paginated results: ```json theme={null} { "data": [ { "id": "ack3p9tw6x7r", "gtin": "00012345678905", "product_name": "Example Product", "brand": "Example Brand", "data_source": "claimed", "confidence_score": 0.95 } ], "pagination": { "page": 1, "page_size": 25, "total_count": 1, "total_pages": 1, "has_next": false, "has_previous": false } } ``` ## Next Steps API key types, RBAC roles, and security best practices. Configure resolution rules, scope hierarchy, and time-based routing. Capture supply chain events with full vocabulary support. Browse all 18 APIs with interactive playgrounds.