System and method for secure sharing of postal services

A method for facilitating sharing of postal services, the method being implemented on a computer system that includes one or more physical processors executing one or more computer program instructions which, when executed, perform the method, the method comprising:

• receiving, by the one or more physical processors, a request to authorize access for a first account of a postal carrier to one or more postal services of a second account of a postal carrier, wherein the authorization request indicates a first identifier associated with the first account and a second identifier associated with the second account;
• combining, by the one or more physical processors, the first identifier and the second identifier to generate a message such that the message includes the first identifier and the second identifier;
• providing, by the one or more physical processors, the message to a cryptographic platform;
• receiving, by the one or more physical processors, from the cryptographic platform, an integrity code associated with the first account and the second account in response to providing the message;
• combining, by the one or more physical processors, the integrity code and the message to generate an authentication token such that the authentication token includes the integrity code, the first identifier, and the second identifier;
• and
• providing, by the one or more physical processors, the authentication token to a user device, the authentication token being stored in an application cache at the user device for use by the user device to use the first account to access the one or more postal services of the second account.