aaaLogin - Sent as a POST message, this method logs in a user and opens a session. The message body contains an aaa:User object with the name and password attributes, and the response contains a session token and cookie. If multiple AAA login domains are configured, you must prepend the user's name with apic: domain\\ . Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2- x/rest_cfg/2_1_x/b_Cisco_APIC_REST_API_Configuration_Guide/b_Cisco_APIC_REST_API_C onfiguration_Guide_chapter_01.html