iOS app iPhone groupon livingsocial site

we already have php groupon script. we need an iPhone apps function like the current groupon and living social. it should support multiple language (change in setting) and cities. XML or JSON API is provided. Best if u did similar before, we hope to finish coding within 10 days (included holiday in between), 10% bonus will be given if can meet our deadline. 10% escrow once u won. 40% escrow when u show first demo 30% escrow after we summit to app store. 10% escrow and will RELEASE the payment once approve. the last 10% after release a month later for bugs fixed. pls quote bugs fix cost after a month too.