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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Can you provide us more details about this.
Please share to us the URL of your Shopify website were we can test the jotform and also for us to evaluate for possible solution.
There is actually way to pre-populate jotform but it is outside the Shopify application. That is by using the Field Prepopulator App ( http://apps.jotform.com/app/field_prepopulator)
We will wait for your updated details.