Create pay function on existing plugin

Avg Bid (CAD)
Project Budget (CAD)
$250 - $750

Project Description:
I have a plugin that uses shortcodes to display a form and submission. The form and display are two separate shortcodes, but I need to add a pay feature to the submission that makes it so the display is downloadable once the payment has been made. This feature has to allow for me to choose whether to make it a pay feature or not. ie: [trainersubmission id=x pay=yes/no]


Skills required:
jQuery / Prototype, PHP, Wordpress
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