How to give someone commercial use license?

I am completely new to selling things on fiverr. Can someone please guide on how a person could give the buyer commercial use license of the project I have created for them. I mean do you have to give a written document or by just saying or allowing them for commercial use is enough.

Hello, I sell on fiverr, on the tos, fiverr says that whatever you produce is implied to be allowed to be used for commercial purposes by the client. There is a separate option that allows you to charge your client extra for commercial use but I never used this option. No written document should be required.

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Thank you so much :blush: