Is a "non-refundable consideration for an agreement" required in California (if I don't have a real estate license)?

[Tommy R]

I don't have a RE license, so do I have to put a certain amount into the contract in order to wholesale (without a real estate license?)
-if so, is there a certain amount required? Or can I just do $10?

-I saw on some contracts it's there, but any other tailored for California did not have it in there, any feedback is appreciated.