Add a Feature to MVC PHP script

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have a php script I believe written in MVC format. That is for food ordering. It was purchase through Php____abbers. and can change source code. I simply need to add a place for the buyer of the food items to leave a TIP just before checkout. image of what needs to be done.

After this I have other requests / other modifications but this one I need now.

When bidding please provide your price and time frame for completion (any time frames longer than a 6 days will be ignored)

Skills required:
PHP, Software Architecture
About the employer:
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