public static void putSelectableMultifactorAuthenticationProviders(final RequestContext requestContext, final List<String> mfaProviders) {
        requestContext.getViewScope().put("mfaSelectableProviders", mfaProviders);
    }
Put selectable multifactor authentication providers.

@param requestContext the request context
@param mfaProviders   the mfa providers
core/cas-server-core-webflow-mfa-api/src/main/java/org/apereo/cas/web/flow/util/MultifactorAuthenticationWebflowUtils.java