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Hello, I have a similar question.

 

I received a 1099-k by paypal for a non-profit service. I reviewed items on Amazon and received the products for free after giving my personal experience for the items. I paid for the items to receive them through Amazon and was "refunded" the payments through PayPal. I did not sell or make money off of any item as said by in the 1099-k. 

 

Is this applicable as non taxable? And if so, do I have to provide screenshots of every purchased receipt reviewed item I bought that fell under this? Or do I need more proof for this?