public function usageCharge(StoreUsageCharge $request)
    {
        // Activate and save the usage charge
        $validated = $request->validated();
        $uc = new UsageCharge(ShopifyApp::shop(), $validated);
        $uc->activate();
        $uc->save();

        // All done, return with success
        return isset($validated['redirect']) ?
            Redirect::to($validated['redirect'])->with('success', 'usage_charge') :
            Redirect::back()->with('success', 'usage_charge');
    }