Systems, devices, and methods for subscription management services including receiving, by a computing device, a message from a message originator user equipment through a messaging service; matching user identification data associated with the received message with an entry in a database; parsing the received message if a match is found; determining whether the parsed message contains a valid request based on the matched user identification data and semantic content of the parsed message; generating a secure service access link based on whether the parsed message is determined to contain a valid request; transmitting the secure service access link through the messaging service to the message originator user equipment; receiving an access response when the secure service access link is accessed by the user equipment; determining if the accessed service access link is valid; and executing the validated request based on whether the service access link is determined to be valid.