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D VelD Vel 

Test Rest API from Salesforce using Named Credentials

I am trying to test the API Callouts from Salesforce using the Named Credentials. I have setup the Named Credentials and OAuth Providers and was able to quickly test the Authentication within Named Credentials
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I am trying to write the Apex Class to see if I can retrieve records from the Rest API I am not how to test Executing this Anonymously without calling from a button/VF Page 
public with sharing class RetrieveD365Data {
    public RetrieveD365Data() {
              Http http = new Http();
              HttpRequest req = new HttpRequest();
              req.setEndpoint('callout:Dev_D365/data/Customers');
              req.setMethod('GET');
              req.setTimeout(30000);
              HttpResponse res = http.send(req);
              System.debug('Response Body===========' + res.getBody());
    }
}
Please help me with this as I am new to Salesforce