Can I hide a form if it has already been completed?

I set up a form that a user sees after registering on my site.  In the form, they give use company info and a few details before paying for our service.  I found the box to not allow multiple submissions of the form, but a user could still fill everything out before it being declined. 

I was hoping there is a way I can hide the iframe completely if they have already submitted a successful form/payment. 

Thanks

I understand that you do want to display the form on your webpage for those who are registered and completed the payment. Unfortunately, it is not possible from JotForm's end to hide the form. However, it may be possible to hide the form from your website end for those who are registered with and depending on how it is built.

Are the users registering on your website separately? If so, are they supposed to use the same email address for registering on the website and filling the form? In this case, you may send the form submissions to an external database and verify the user logged in with the submissions if they have paid for your service. It is required to write some custom code to hide the form if the user logged in has already paid. You may need to hire a programmer to do this if you are not comfortable in programming with web technologies.

Hope this information helps! If you are referring to something different or need any further assistance, please let us know. We will be happy to assist.

Ok thank you for the response.  I thought it might need to be custom coded, ill look into it.