Integrate wordpress forms with external program via API - repost

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

Project Description:
High Level:

I have created a website for unlocking mobile phones.
The product page should be updated based on details available from API.

Once a user has purchased our service, the information that we have captured must be sent to an external site (API details provided). This site will take the details and create an order. When the order has been externally fulfilled, it must be passed back to my site via the API. The fulfilled order will take the form of an unlock code. An e-mail must then be automatically generated and sent to the customer with the unlock code and instructions embedded into it.

Here is a more detailed breakdown:

Page 1
User lands on the following page:
User chooses handset model from pull down on lander 1
Pull down must be customisable by us.
After handset chosen, choice recorded and the relevant 2nd page loads.

Page 2
Each Model will have its own Product page (to be created by me)
This page shows details about pricing and delivery time for that specific handset. User clicks "Order Code" and is then taken to order data collection page (page 3)

Page 3
Does not exist yet but would look something like this (but better):
[url removed, login to view]

This page has a form on it that collects:
Prepopulated model number from lander 1
Network (Orange, SFR...)

User clicks on Add to Shopping cart button and is taken to Paypal payment page.
The paypal page must be prepopulated with the previously chosen handset and the price.

After payment has been collected the following data must be passed via an API to [url removed, login to view] or:and [url removed, login to view]

Manufacturer: Default iPhone
Model: iPhone 3G, 3Gs, 4, 4S, 5
IMEI (Validation required)

When [url removed, login to view] has generated the unlock code, this must be automatically passed back to our site via the API.

Our system must then generate an e-mail based upon a template and send it to the customer automatically. This e-mail must contain unlock instructions based upon the model number (How?) and the unlock code. The e-mail address must be taken from the e-mail address that was used to process the paypal payment.

It would be useful if we could use the Gravity Forms Plugin. This is because the backend already exists.

The external site uses Dhru Fusion. Here are the API details: [url removed, login to view]
Or Oneunlock: [url removed, login to view]

Here are the Customisation details for Product Add-ons Forms:

Please only bid if you have excellent user reviews and plenty of experience doing this kind of work. Thank you.

Skills required:
Electronic Forms, MySQL, Paypal API, PHP, Wordpress
About the employer:
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