Zendesk works well. It creates buckets of communication and makes it easy to track all customer engagement. If someone tries to contact you through a different channel, you can track it.
Stripe is our provider. It’s plug and play. They have a subscription package that is very helpful. One thing that they could improve is how they are handling donnage. Often after people subscribe, if their credit card expires, we end up with an unintended cancellation. There are tools that are better at managing this aspect.