JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can see the list of payment integrations that we currently have by clicking the "Payment Fields" section in the form builder.
You can check the following links to help you further:
Also, it seems like Google Checkout is no longer part of our supported payment integrations based from the list that we have.
Let us know if you have further questions.