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1. In your Postman application, create a new GET request with the following endpoint: http://local.api.firehost.net/roles
2. Click Headers. 
3. Under Key, select Authorization. 
4. In Value, enter {{hmacAuthHeader}}.
5. Under Key, select Content-Type. 
6. In Value, enter application/json. 
7. In Body, enter your IP address. 
8. Click Pre-request Script. 
9. Enter the script below with the following updated parameters: 

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