Hi,
I've been developing similar solutions for years in PHP/mysql.
Will you have a linux host to run it on ?
By saying API do you mean you already have a system to connect to, or you need application to have an API ?
Could you describe project in your own words how and for what should it be used, some case studies, it would allow me to design better application .
If you also could tell what the ticket is it would help .
For sure its worth more than 30$ i will need to work more than 24h on this one, but as you can see it's my first steps in freelancer.com so I need recommendations, so this is your chance
cheers
Jakub Bernatowicz