I've implemented subscriptions through ReCharge where users can select products and these are saved as line item properties for that product. This was the only solution I could think of with my limited time using Shopify.
Per this question, it seems like line item properties are read-only after checkout. If this is truly the case, is there any solution that enables having modifiable subscriptions where users can re-select products for that subscription product that I can implement?
I'm using Shipstation for the shipping piece if this matters at all.