A method is disclosed. The method includes receiving, at a computing system, from a user, a request for an access code and one or more constraints on a use of the access code, and identifying a portable device to be associated with the access code. The method also includes obtaining, using the portable device, authorization for one or more potential interactions using the access code. Upon obtaining authorization for the one or more interactions, the method includes generating the access code, which includes an identifier that causes an access request that includes the access code be routed to the computing system. The method also includes receiving, from an access device, an access request comprising the access code in an interaction. Upon determining that the interaction complies with the one or more transaction constraints, the computing system provides an indication to the access device that the interaction is authorized.