Hi! I 've seen your requirements and I'm interested in it, I've expertise in DBMS(Oracle, MS SQL, mysQL), PHP, magento,wp ,joomla, ASP.Net MVC,WCF and asmx services, Client side(JQuery Prototype).
I 've worked on such projects many times, expert in integrating SOAP and RESTFul API.
let me know if u r interested in my bid, share the API link(plus service documentation if u have that)