Ask Should Snapchat influencers ask for a contract before starting a paid campaign?

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I'm honestly a little unsure about where to draw the line with brands. I've been lucky enough to get a few paid campaigns after investing time in my Snapchat account. I save all my emails and DMs just to have a record of what gets said during negotiations.

Sometimes, brands seem fine discussing the details over chat and move quickly. I keep wondering if that's normal in this world or if I should slow things down before officially working together.

Should Snapchat influencers ask for a contract before starting a paid campaign?