Yes it is an integration. Depending on what you select in the form the data will be synchronized. Example orders will be syncd from Shopify to Revel, inventory will be deducted. Or if you select that products should be syncd from Revel to shopify it will be interactive.
You will have an hour of built in support with the 100+ per month plan. If you would like more support we can organize a quote by the hour our rates are 150 usd per hour.
Transitioning - We set the sync to disable and you can activate then do some fake acceptance testing example make a fake order, example change a product or receive a product / reduce inventory. It is then your responsibility to test and understand the two systems sync set up.