Patent ID: 8850551

Claim:
A method for controlling an information processing system, wherein the information processing system comprises a relay service device that performs relay processing related to a service provided from a print application to a user via a network, an intermediate service device that communicates with the relay service device and performs relation processing related to the service, and an authentication service device that receives an authentication request from the intermediate service device and performs authentication processing, the method comprising: transmitting, by the relay service device, an authentication request to the intermediate service device; transmitting, by the intermediate service device, the authentication request from the relay service device to the authentication service device; acquiring, by the intermediate service device, a first access token from the authentication service device in response to the authentication request being successfully authenticated; storing, by the intermediate service device, the first access token; comparing, by the intermediate service device, the stored first access token with a second access token included in an execution request, the execution request comprising a request for performing image format conversion processing for a printing service; executing, by the intermediate service device, the image format conversion processing if it is determined in the comparing that the first access token matches the second access token included in the execution request; and transmitting, by the intermediate service device, a response relating to the image format conversion processing.