JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Do you mean to have three column products for your payment form? If so, please refer to the following guide that can help you with this.
The code provided in the guide should split the columns into two. However, a little modification to the code could help in having three columns by changing the width to 230px and padding-top to 30px.
This is how it looks like with 3 column products list.
If you are referring to something different, please let us know. We will be happy to help.