Community Tip - Did you get an answer that solved your problem? Please mark it as an Accepted Solution so others with the same problem can find the answer easily. X
getImplementingThings and getImplementingThingsWithData services not present for thingtemplate's dynamic services while trying to access from mashup workspace. GetStreamData also not available. My thingworx version is 9.2.3.
I believe getImplementingThings and getImplementingThingsWithData services are not dynamic in nature. They are executed on the current entity only. You can mix these services with other dynamic services for your use case, for example - https://support.ptc.com/help/thingworx/platform/r9/en/index.html#page/ThingWorx/Help/Mashup_Builder/DataServicesandLinking/DataServicesandScalableSolutions.html