Ucommerce includes full API reference documentation and lots of helpful articles to help you build your e-commerce site as effortlessly as possible.
The level of support that is expected is that same the we offer ourselves which is a 48 hour SLA. This means that it is expected that you get started on the support within 48 hours of the case being posted on Eureka.
You can support your app through Eureka, on your app's download page there is a link to the section of Eureka where questions can be posted related to your app. Through Eureka you're able to subscribe and receive notifications when questions are posted in your section.
Questions will get posted on your section when the users add a tag with your Appname in their posts. You do not have to do anything to activate it yourself other than subscribe using the link on your app page.