Bundle discount

Hi

I already asked for this quite some times ago (see https://stackideas.com/voices/payplans/item/689-discount-option-to-automatically-add-a-d) but I don't think you've worked on it. Here is the description:

We sell multiple subscription products. We'd like the ability to offer a discount to user who already have one subscription.

Example: we have subscriptions A, B and C. I user subscribes to plan B but already have A or C, automatically show and deduct 20% from new purchase of B.

Note this is very different from creating bundles. Bundles have the same start/date time and require prorating amounts.

Is there any way to achieve this with Payplans? we strongly need the ability to have a discount if people buy another plan, but bundles are not good because they require same expiration dates on both plans. And you also cannot really refund only one of the items in the bundle for instance.

So again, how can we achieve this? do you have a more advanced "Discount" app or something?

Best regards

Yannick