Get ASANA Users from Apex salesforce

get_users

public static List<ASANA_User_wrapper> getUsers() {
		
	List<ASANA_User_wrapper> list_asana_users 		= new List<ASANA_User_wrapper>();
	

	HttpRequest aRequest 	= new HttpRequest();
 	aRequest.setEndpoint('https://app.asana.com/api/1.0/users');
 	aRequest.setMethod('GET');

 	String username = API_KEY;
 	String password = '';

 	Blob headerValue = Blob.valueOf(username + ':' + password);
 	String authorizationHeader = 'Basic ' + EncodingUtil.base64Encode(headerValue);
  	
  	aRequest.setHeader('Authorization', authorizationHeader);

  	Httpresponse aResponse = new Http().send(aRequest);
  	JSONParser parser = JSON.createParser(aResponse.getBody());

  	ASANA_User_wrapper user = new ASANA_User_wrapper();
	while (parser.nextToken() != null) {
		if (parser.getCurrentToken() == JSONToken.START_ARRAY) {
			while (parser.nextToken() != null) {
				if (parser.getCurrentToken() == JSONToken.START_OBJECT){
					user = (ASANA_User_wrapper)parser.readValueAs(ASANA_User_wrapper.class);
					list_asana_users.add(user);
				}
			}
	  	}
	}

	return list_asana_users;

}