Hi,
This project seems to be quite interesting to us. We have worked quite often on API based worked. One of the project was related to Mailchimp, in which client wanted to integrate their site subscription to Mailchimp account using API.
We have good knowledge of how to debug them and get it working. In one of the other project in which client want auto-responder in Campaign Monitor based on subscription from other site. We also took care of re-usability and ease to integrate with customer website.
We had good experience in such kind of project and know how to tackle problems related to integration of API's.
Let me know how we can initiate so that we can finish it as soon as possible.
Regards, Nitesh | skype: themindtracks