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Unfortunately, we don't have a feature that would allow you to import the product list. You will have to manually configure them in the integration.
If you wish, you can just setup that one using a checkbox field for multi selection or radio button for single section. You can then calculate the items using our calculation widget: http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form.
Next, you can pass the total from the calculation to the payment integration: http://www.jotform.com/help/275-How-to-pass-a-calculation-to-a-payment-field.
Note, you can add a calculation values for the checkbox or radio button options: http://www.jotform.com/help/301-How-to-Assign-Calculation-Value.
Let us know if you need any further assistance.