Unfortunately, Shopify’s native “Buy X Get Y” discounts don’t support subscriptions at this time – they only apply to one-time purchases.
However, there are two ways to work around this limitation:
1. Use an app like Kaching Bundles – Quantity Breaks, which supports creating “Buy X Get Y” style discounts that work with subscriptions.
2. Use a native automatic discount based on the number of products in the cart. For example:
Set up a 33% discount when 3 items are added to the cart.
Ensure "Discount applies to all recurring payments" setting is checked
This effectively mimics a “Buy 2, Get 1 Free” deal (see the attached screenshot for reference)
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