Hi,
If you want to never have GMU issues again then our Api Gateway Manager (AAGM) is the way to go. It's our replacement for GMU + LOTS MORE.
We've already been through all these hoops before with many customers, so you don't have to find the same issues.
https://apiida.com/apiida-api-gateway-manager/?lang=en
PM me if you need any help.
Regards
Vince Baker