Updates execution/authentication.md

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apidesigner
2017-05-31 14:59:00 +00:00
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@@ -13,4 +13,12 @@ Every API that requires user authentication or authorization **MUST** use OAuth
## API Key
If an API doesn't need to authorize users the API **MAY** use simple API token instead of the OAuth 2 token. The key **MUST** be provided in the `Adidas-API-Key` HTTP header.
#### Example
```
GET /demo-approval-api/ HTTP/1.1
Adidas-API-Key: 9kfapap6612jkfd3ja9323q
Host: adidas.api.mashery.com
```