Release Automation : Version 6.4, 6.5 & 6.6
The API layout in 6.4 and higher had been undergoing refactoring for better alignment and structuring to product design. We have gap in our documentation content which is not aligned to restructuring happened around REST API. We have informed the technical team to have correction for same.
The root cause for above API access issue, is that above API is no more available under PUBLIC_API segment rather moved to ADMINISTRATION segment, henceforth no more available for access at old URI (it's the actual reason for error 404).