E-commerce

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Hi,
I have noticed a problem in my e-commerce package. When someone tries to purchase something from my website, there is a message saying that there needs to be a minimum of $72 in the cart. How do I get rid of that and allow people to buy something for less than that amount?

It is probably a line of code somewhere. Concrete 5 is our web host and I can't find any server files.

Thanks in advance for any help.

GrahamAndGraham