Membership is only part of our online sales strategy, we sell online through website, amazon, facebook, etc. etc. and we use a shipping service called Shipstation which bring all orders from all channels into a centralized location. Right now, I have it bringing in membership orders (because we actually mail out membership cards, swag, and shirts) through PayPal but it would be very helpful if orders from PayPlans were integrated into Shipstation directly, that or I'll have to set up a second Paypal account.
Here is how to integrate with it - https://www.shipstation.com/docs/api
Let me know if this is something you all could make a paid app. I'd be your first customer.