ReCharge fully integrates with Shipstation. All your orders created through ReCharge will populate into Shopify. From there, Shipstation will read them as if it was an order coming in directly from Shopify.
We offer a feature that allows you to include helpful notes about where someone is in their subscription cycle into the notes section of each order. Shipstation then can read the notes and automatically apply logic to your fulfillment process to get your customer the right box given where they are in their subscription cycle. This could prove useful if you send different items for the 2nd, 3rd, 4th cycle.
In order to enable this, contact us.