Accepting Refunds Not for Profit

Description

What is the correct way to use Paypal to receive money in this scenario? I review tech products and I get a lot of inquiries from individuals in China that want for me to review their product. What most of the inquiries propose is that I purchase the product and once I complete and release my review of the product they will refund the full cost of the product via paypal. It’s their way of making sure that I keep my promise to review their product. I am not charging to review the product, I am just getting my money back for the product once I complete my review. So, in the end, I am not profiting or making any money, I am simply receiving a product to review. How can I use Paypal to handle these type of transactions to be compliant with Paypal’s TOS? Thank you in advance for your help, Adrian