We have seen a lot of usage of MQ Internet Pass-Thru gateway, MQIPT. MQIPT was originally released as a support pack (MS81) and is delivered as a standard feature of MQ (MQ 9.1.4).   The support pack will no longer be supported after September 2020.    

Note, that it is possible to use MQIPT from 9.1.4 and later with earlier versions of MQ.