Is there a way to require customers to sign the terms and conditions at checkout?

I've figured out how to add our contract (for our services) to the checkout page, but I would like to have it so that the customer needs to sign off on it before they place their order. 

Is your contract on a form at check out? Just add a radio button or tick box against the contract in the form and set it to mandatory.

if it is for a specific service (product) and not for all purchases,  you can add the form on the product itself and they will need to read and tick when adding to basket/purchases.