Must know and use the Wordpress plugin from Gravity Forms.
Need to develop an "add-on" plugin similar to the existing add-ons that connect other services to it (like Mailchimp and Paypal).
Appears to be relatively straightforward, and looking for a coder who can knock out a functioning model quickly. One we can refine through use for the next couple weeks thereafter.
Do not bid if you are not able to do this work quickly, efficiently, and professionally.
I do not do escrows on small projects like this and will not pay anything until a functioning model is delivered.