## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://developer.fabric.inc/llms.txt)

Use this file to discover all available pages before exploring further.

When making calls to fabric APIs, you must use the following HTTP headers to provide context.

- **`--header`**: This flag is used to include headers in the request. The most commonly used headers in fabric APIs are:

- **`x-fabric-tenant-id`**: This is a custom header used by the API to identify the tenant making the request. You can [find the tenant-id](https://developer.fabric.inc/v3/platform/settings/account-details/getting-the-account-id) in Copilot.
  - **`Content-Type: application/json`**: This tells the server that the data being sent in the request is in JSON format.
  - **`Authorization: Bearer`**: This is the authorization token used to authenticate the request. You must pass the access token generated from the system app.
  - **`x-fabric-channel-id`**: This is a custom header, used to identify the channel through which the request is being made. This is primarily used for a multichannel use case. Usually, the default value is 12 (US).

fabric API responses are in JSON format.

#### Prerequisites

Before you can start using fabric APIs:

- Generate the access token by following the instructions in the [Getting Started with fabric APIs](https://developer.fabric.inc/v3/getting-started/api-guides/getting-started-with-fabric-apis) section.
- Get the x-fabric-tenant-id by following the instructions in the [Getting the Account ID](https://developer.fabric.inc/v3/platform/settings/account-details/getting-the-account-id) section.

#### Procedure

The following steps use [Create attribute](https://developer.fabric.inc/v3/api-reference/product-catalog/attributes/create-attribute) as an example:

1. Log in to Postman client.
2. In the left menu, click **Import**. The import window will display.
3. In the import window, copy and paste the following code:

```
   curl --request POST \
   --url https://api.fabric.inc/v3/product-attributes \
   --header 'Content-Type: application/json' \
   --header 'Authorization: Bearer <token>' \
   --header 'x-fabric-tenant-id: <tenant-id>' \
   --data '{
      "name": "Category datetime example",
      "isLocalizable": false,
      "target": "CATEGORY",
      "type": "DATETIME",
      "validation": {
         "isMandatory": false,
         "isManualOverwrite": false,
         "formula": "",
         "dateFormat": "MM/DD/YYYY"
      }
   }'
   ```

4. To populate the headers, click the **Headers** tab and do the following:

- To enter **`Authorization: Bearer`**, replace **Bearer <token>** with the access token you generated from [Getting Started with fabric APIs](https://developer.fabric.inc/v3/api-reference/getting-started/getting-started-with-fabric-apis) section.
   - To enter **`x-fabric-channel-id`**, replace **<tenant-id>** with the tenant-id you obtained from [Getting the Account ID](https://developer.fabric.inc/v3/platform/settings/account-details/getting-the-account-id) section.
5. Click **Send**.