US Patent 9990786 Visitor credentials

A request is received by a member of a credential granting authority to issue an electronic visitor credential to a visitor of the credential granting authority, the electronic visitor credential enabling access to resources of the credential granting authority. It is determined that the member of the credential granting authority is authorized to issue the credential to the visitor. Based on the determination that the member of the credential granting authority is authorized to issue the credential to the visitor, the electronic visitor credential is issued with at least one timing restriction that defines a time period during which the electronic visitor credential is valid and at least one usage restriction that limits resources of the credential granting authority to which the electronic visitor credential enables access It is determined to withdraw the electronic visitor credential. Based on determining to withdraw the electronic visitor credential, the credential is withdrawn.