discourse-subscriptions/assets/javascripts/discourse/routes/subscriptions.js

import Route from "@ember/routing/route";
import { service } from "@ember/service";

export default class SubscriptionsRoute extends Route {
  @service router;
  @service siteSettings;

  beforeModel() {
    const pricingTableEnabled =
      this.siteSettings.discourse_subscriptions_pricing_table_enabled;

    if (!pricingTableEnabled) {
      this.router.transitionTo("subscribe");
    }
  }
}