Make sure your build settings preprocessor macros include PROD
under your release configuration.
Per your comment, Just wanted to make sure this is what you did.
#ifdef QA
#define kLogin_URL @"https://b2bgateway.qa.mycompany.com/authenticate"
#define ktran_URL @"https://b2bgateway.qa.mycompany.com/.../lookup"
#define LOGIN_REQUEST_TIMEOUT 15.0f
#define TRAN_REQ_TIMEOUT 60.0f
#else
#define kLogin_URL @"https://b2bgateway.mycompany.com/authenticate"
#define ktran_URL @"https://b2bgateway.mycompany.com/.../lookup"
#define LOGIN_REQUEST_TIMEOUT 15.0f
#define TRAN_REQ_TIMEOUT 30.0f
#endif