Emails and tech support. I then had to help a client with a custom ecommerce checkout process. They wanted it a little bit tighter, so we added some code and a redirect if other things were needed. Sent them an email with instructions to the client. We also got an email from the same company with some other updates. They found another small bug and we went in and fixed it. I'm so grateful for users who push on things and then let us know if things need some help. Good stuff.