Simple wordpress multisite plugin

Avg Bid (USD)
Project Budget (USD)
$10 - $120

Project Description:
I'm looking for an expert to write a Wordpress plugin for the direct sale of a limited number of products.
I expose the project in detail: I need the freelancer create a plugin fully compatible with WordPress Multisite and that he uses the full features of wordpress, leaving nothing to chance. That said, I expose a list of features that will have the plugin:

1-Ability to insert N products (N set for each site by the administrators of the entire network for any specific site in the network)
--The inclusion of these products must take place through the Custom Post by wordpress with adjoining changing, and deleting.
--The user can enter for each product: Product Name, Product picture (with size limit (in MB) imposed network administrator), product price (excluding taxes),% of fees to be charged on the price
2-Small-interface for setting up a paypal account for each site in the network (without setting the PayPal Sandbox, Live mode only) with links to the generation of the API for easy configuration to the end user.
3-The product should be viewable in any template by calling the "actions" (do_action, add_action etc.) of wordpress (implemented via PHP) with and in HTML.
4-It is possible for the visitor to buy any product directly on PayPal (so WITHOUT a cart)
5-Each component in the GUI administration, will have to completely rely on classes and default styles for wordpress.
6-Very important: the freelancer will have to be completely independent, I do not have time to follow him, then he will have to be based on this description (which still I think is quite detailed).

I do not think it is a very complicated project, so the budget is not very high, but certainly, the freelancer will work with me (if he will be good and will meet deadlines) will be contacted for the realization of other plugins and for a long collaboration.

This is it.
I ask all freelancer to write here the final bid. I also wonder do not write in the chat, I'll contact you.
I also request you to stick to budget described in the project and not go beyond it, those who have a higher bid, may abstain, will not be contacted.

Thank you.

Skills required:
CSS, HTML, HTML5, PHP, Wordpress
About the employer:
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