Working with a data/sass startup  and a customer expressed really wanting a feature in our roadmap scheduled for Q1 of next year (at least). Offered money and/or engineering resources to help us bump it to the front of the line. This is a feature that requires building a new data pipeline and so on, talking months of work. It's not a small feature.I hear that this is a common thing, customers offering money to have features bumped forward. How does it work? I don't want to create any ambiguity about the ownership by accepting engineers from their company. It's also a little bit weird to co-mingle like that when money is exchanging hands.The next portion is money, if we request money to hire additional people or for materials, what percentage do we ask for? We're still building a feature that will live in our product after this build out is done. I almost feel like it doesn't make any sense to let a customer sponsor something with money.Can anyone provide any advice? Is there a term for this? articles? is anyone willing to advice me via phone for a free? Super confused, don't want to mess this up! Thanks in advance.