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Yes. You can use more than 1 coupon code on the payment field of your form.
User guide: How-To-Add-Coupon-Code-in-the-Payment-Form
Let us know if you need further assistance.
But can they apply more than one coupon to their payment? I didn't see that. One would be for paying early and the other would be for being a non-profit, so they would need to use both.
If what you meant is applying multiple coupon codes on one payment submission, then I believe it is not possible. There's only one coupon code box.
What might be possible is using multiple coupon code variations that applies different discounts on your specific products or on all of your products.
Or your users can make separate submissions using the two or more coupon codes that they have.