How do you typically structure a deal between two partners?

[Jordan Gilberti]

I have a few people in my network that have offered to fund my next real estate purchase. What is a typical way to structure this that is fair? Let's assume I am the one finding the deal, managing the property, everything. They are simply writing me a check for the downpayment/rehab. Is 50-50 fair for equity? Or just straight loan with interest? Or a combo of the two? Thanks so much for your input!