NOTE: You will need to obtain a Personal Access Token for the API https://www.ownerreservations.com/support/articles/api-auth#personal-access-tokens. Without a token you will not be able to successfully obtain valid API results.
Setup System/User environment variable. Details on advanced editing StackOverflow superuser walkthrough
WinKey + R
Copy and Paste the following text to the Open: input text box for the Run Dialog
%windir%\System32\rundll32.exe sysdm.cpl,EditEnvironmentVariables
Add a user or system environment variable to hold the owner_rez_username and owner_rez_token keys. User environment variables will only be available to your particular user, system environment variables are shared for all users on the system