How do I require customers to accept my site's Terms & Conditions before placing their order?

This can be achieved using Pulse Commerce's Checkout Survey Manager functionality:

1. Go to Marketing > Checkout Survey Manager.
   
   
2. For the Checkout Survey Heading in the Store Front field, enter the heading you want customers to see during checkout. 
   (For example, we have set the question to Required information.)
   
    
3. In the Checkout Survey Question (New) section, specify your question in the Question field.
   (For example, "Do you accept the Terms & Conditions of this site?")
   
   
4. Select the Visible check box and the Required check box.
   
    
5. Enter your Terms and Conditions text into the WYSIWYG editor.
   
   
6. Select the Open in popup checkbox to have the Terms and Conditions appear in a popup window. 
   
    
7. Click the Add button.
   
   
8. In the List of Checkout Survey Questions, click the Edit Options link beside the question you input in step 3.
   
   
9. In the Checkout Survey Question Options popup window, enter Yes into the Question Option field, and click Add. 
   
    
    
10. Click the Close button. Customers on your storefront will now need to confirm that they comply with your site's Terms & Conditions before placing their order.