I think this should help you : CA Mobile API Gateway
reference: http://www.ca.com/us/securecenter/ca-mobile-api-gateway.aspx
We are planning to trial this API this month, I would update this answer again with the review. I really feel afraid using these APIs related to the security from the mobile because the applications are so sensitive even a "." on these API can create havoc. And also, I don't know how secure the mobile connections would be but let's give a try on test servers!