Full recurring payment / cancellation support for Wishlist Member
Wishlist tech support informs me that although they support full recurring payment (and cancellation) integration with many other shopping carts, they currently do not fully support it with 1SC. They said they are working with 1SC to solve the problems, but there is no ETA for when a fix will be ready (on 1SC's side).
Apparently 1SC does not properly notify when a card or payment is declined, and so a site owner must login to 1SC periodically to check for users who have whose cards have been declined, and then manually cancel their membership in Wishlist Member.
This seems like a pretty basic call-back feature that would be great to have -- other carts provide it, but it doesn't seem to work with 1SC.