---
title: Request header
slug: product-recommendations/docs/header-information
docTags: 
createdAt: 2026-07-30T20:41:30.384Z
---

Place authentication information (such as site and siteToken, and channel) in the request header (rather than the JSON payload defined in the subsequent sections).

- `site` – Optimizely client site code. This name is the site code provided by Optimizely that identifies the retailer's site. For example: `site: streamlycool`
- `siteToken` – Authentication token for the client. Find this token on the **Admin > Development > Site tokens** page in the Product Recommendations app. You must include the token as part of the JSON data in every API call. For example: `siteToken: 1234abcd5678`
  A separate `siteToken` is issued for each channel. Ensure that you use the correct token for your channel.
- `channel` – Access channel. It should be one of the following: store, mobileapp, tv, callcentre. For example: `channel : store`
  Contact Optimizely if more channels are needed. A separate siteToken is issued for each channel. Ensure that you use the correct token for your channel.
- `Content-Type` – The MIME type for JSON text:  `Content-Type: application/json`