Information processing system and information processing method

An information processing system, comprising:

• a wrap server;
• a central system;
• and
• one or more external systems in association with the central system via the wrap server,
• the wrap server, the central system, and the one or more external systems being connected to a network,
• the wrap server including
• a communication device capable of communicating with the central system and the one or more external systems,
• a storage device that stores a contract table that describes contract information between a manager of the central system and a user who uses the central system via any one of the one or more external systems and via the wrap server, and
• a controller circuit,
• when the controller circuit of the wrap server executes an information processing program, the controller circuit operating as
• an API call receiver module that receives a unified API call from each of the one or more external systems,
• an API call converter module that converts an API call received by the API call receiver module into an API call corresponding to the contract information on a basis of the contract table and a user name of the user as request-source information, the request-source information being an argument of an API call received by the API call receiver module,
• a converted API call module that calls a Web API supplied by the central system by using the API call converted by the API call converter module, and
• an information return module that returns information to an external system that called the wrap server, the information being returned by an API call from the converted API call module to the central system.