Source code is already complete for the front and back end of a campaign-sales-based ecommerce site in PHP using the Zend framework. Payment integration with Paypal is now needed, and is what is being hired for.
PayPal has a API that allows for crowd-funded campaigns, meaning many people pay for something in advance and if the campaign is successful, PayPal will release funds to the campaigner. If the campaign does not fund, then PayPal releases advance payments back to the buyers. Experience with this API is a must.
For cover letters, please include:
PayPal Integration Experience
PHP and Zend experience
Availability to begin
Estimated time to complete (based on prior project experience)