How can I change a submission to be complete after payment made?

Users have two ways to submit a registration submission: 

One -  they pay with PayPal and or use credit card which marks the submission as paid.

Two - they pay by check which when the form is submitted is marked incomplete submission.  Once I receive payment I want to be able to show that payment on the submission report that is generated when I click on "Submissions" for a particular form.  the form in question is 2015 Vendor Registration. 

Any help you can provide will be appreciated.

Thanks.

If you want to setup Paypal along with another payment option, please check this guide:

http://www.jotform.com/help/120-How-to-set-up-paypal-along-with-other-payment-options

You can also edit the submission status from the submission view , here is a detailed explanation :

http://www.jotform.com/help/194-How-to-Assign-a-Status-to-Submissions