https://www.ibm.com/docs/en/ibm-mq/9.3.x?topic=descriptor-useridentifier-mqchar12-mqmd
UserIdentifier (MQCHAR12) for MQMD
https://matrix-org.github.io/matrix-js-sdk/types/matrix.UserIdentifier.html
UserIdentifier | matrix-js-sdk
Documentation for matrix-js-sdk
matrixjssdk
https://www.ibm.com/docs/en/ibm-mq/9.1.x?topic=descriptor-useridentifier-mqchar12
UserIdentifier (MQCHAR12)