The first step in migrating your subscriptions from Subi to Appstle is obtaining the proper CSV exports from Subi.
If you aren't familiar with Subi's export process, please take a look at their documentation, with detailed instructions on how to export your subscriptions.
Once you're ready to export the data from Subi, please make sure your export contains all of the necessary information below:
Subscriptions - All
Charges Queued (up to 1 year in the future)
Customers - Shipping Addresses