u/Super-Spirit2644

Hi, I’m a new Shopify owner, I just started my small business for a month and got no sales. I recently got a few emails from different people, all from fiverr.
After some discussion they claimed they can bring healthy traffic into my store and increase my sales. They don’t charge anything upfront and will take 3% commission on the addition traffic made from their business strategy.
All of these sounds too good to be true, I know I need to give them some access to my Shopify account, other than that I’m not sure how the scam works? Or is it a real thing?
If anyone had experience I’m would love to know the catch here.
Thanks in advance