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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Please check the following guides to help you integrate a payment tool.
1. How to setup an order or payment form: https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form
2. Here's the list of payment integrations that we have: https://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm
3. Here's the specific page for 2CheckOut integration: http://apps.jotform.com/app/2checkout_integration
After adding 2CheckOut integration in your form, you'll see that you'll need to add your 2Checkout vendor number.
After that, setup your product listing and save the changes. You now have an order form, should directly receive payments in your 2CheckOut account whenever a user fills out your order or payment form.
Let us know if you need more help on this.