An application service system receives, from a merchant service system, an application program code comprising identifying information. The identifying information is extracted and the application is distributed for operation on a user device. A user interacts with the application, creating an access request that is transmitted to the application service system along with the extracted identifying information. The application service system transmits an access token to the user device comprising the received identifying information. The user device transmits the access token with a service request to the application service system. The application service system compares the identifying information from the access token to the identifying information extracted from the application program code received from the merchant services system. If the identifying information matches, the service request is processed. If the identifying information does not match, the service request is denied and an error message is transmitted to the user device.