I recently used Laravel Spark [ https://spark.laravel.com/ ] to manage all the subscriptions and I really love it! Before I had to do it all by myself and it was a nightmare and so much time taken away to develop the real app. I highly recomment it for any SaaS product. It gives you a huge jumpstart and you can concentrate on developing just your app. Btw, it supports both Stripe and Braintree.