Can anyone post an example RestAPI call script?

I tried and got an error message, see below

Am i missing anything?

Error executing script:VS.Jira.RestAPICall is not a function TypeError: VS.Jira.RestAPICall is not a function at VisualScript (<anonymous>:13:11) at SDIDE.IDEEditor.RunScript (https://<<>>/plugins/servlet/sdjscloudvss/VisualScriptStudio/Views/ReportEditor/VSSREEditor.js:214:17) at https://<<>>/plugins/servlet/sdjscloudvss/VisualScriptStudio/Views/ReportEditor/VSSREMainController.js:1287:25 at commonCallback (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/Views/ReportEditor/VSSREMainController.js:272:21) at Object.success (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/Views/ReportEditor/VSSREMainController.js:290:29) at u (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/lib/jquery-3.3.1.min.js:2:33479) at Object.fireWith [as resolveWith] (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/lib/jquery-3.3.1.min.js:2:34432) at k (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/lib/jquery-3.3.1.min.js:2:93825) at XMLHttpRequest.<anonymous> (https://<< host >>/plugins/servlet/sdjscloudvss/VisualScriptStudio/lib/jquery-3.3.1.min.js:2:96455)