Abstract: Techniques to validate web service requests from applications executing on wireless communication devices are disclosed herein. In at least one implementation, an application that generates a web service request is executed on a wireless communication device. The wireless communication device executes a client security component of the application to collect security information and include the security information in the web service request, and utilizes a mobile application programming interface to transfer the web service request including the security information for delivery to a web server. The web server executes a server security component of a web service to extract the security information from the web service request, validate the web service request based on the security information, and provide the web service request to the web service upon successful validation.