Hello,
I completely understood your requirements, already worked on DHL API and Shipping integration.
Please send me the complete details so that I can analyse the requirements and get back to you,.
I have already worked with various APIs like : Paypal api, WordPress api, ebay api, twitter api, pixabay, sage api, clipart, instagram,facebook api, Google+, linkedin, picasa, flickr, NextGen API, Affiliate Window API, Ebay Trading API, Magento REST API etc
>>Sports related : Betfair API, ESPNAPI, Global Sports Media API
cs
>>Related to Email newsletter : Graphic Mail, Ebrain API, MailChimp, AWeber, Jot Forms
I am right now available on Skype for the complete discussion.