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Create a bundle discount in ecommerce

I sell four products on my website.

I would like to provide a bundle discount - if you purchase all four products you get a 20% discount.

Is there a way to do this?

Depending on your circumstance you might set a discount where the discount is only valid for a minimum order value. Alternatively it might be easier just to add a new product (e.g. 4 product bundle) with the discount already applied.