code: protected static void setCredentials(Selenified clazz, ITestContext context, String servicesUser,
                                           String servicesPass) {
          context.setAttribute(clazz.getClass().getName() + SERVICES_USER, servicesUser);
          context.setAttribute(clazz.getClass().getName() + SERVICES_PASS, servicesPass);
      }
docs: Sets any additional headers for the web services calls for each instance of the test suite being executed.
  
  @param clazz        - the test suite class, used for making threadsafe storage of
  application, allowing suites to have independent applications
  under test, run at the same time
  @param context      - the TestNG context associated with the test suite, used for
  storing app url information
  @param servicesUser - the username required for authentication
  @param servicesPass - the password required for authentication