Donations count toward free shipping minimum

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Hello Everyone.

Is there a way to keep charitable donations from counting as a purchase when it comes to reaching the free shipping minimum? 

I have products, but I also let people add charitable donations to the cart. I use a couple of apps to add the donation products (One Tree Planted and Pledgeling).

If, for example, I have free shipping set at $50 and someone buys an item for $40 and then adds $10 to a donation, the free shipping rate I set up through Shopify shipping settings triggers and gives free shipping.

Thanks. ♥♥