fitx-simple.js

/**
 * Script for scriptable to get the current capacity of FitX Gyms 
 */
let gymId = 1265369
let api = "https://fitx-proxy.daniel-stefan.dev/api/utilization/"
let param = args.widgetParameter
if (param != null && param.length > 0) {
    gymId = param
}

const gymDetails = await fetchGymDetails(gymId)
const currentGymCapacity = gymDetails.workload
const gymName = gymDetails.name || 'Your FitX'
const widget = new ListWidget()
await createWidget()

if (!config.runsInWidget) {
    await widget.presentSmall()
  }

Script.setWidget(widget)
Script.complete()

//Create the widget
async function createWidget() {

const headlineText = widget.addText("🏋️ Capacity")
headlineText.font = Font.mediumRoundedSystemFont(19)

widget.addSpacer()

const widgetStack = widget.addStack()
widgetStack.layoutVertically()
widgetStack.bottomAlignContent()
	
const capacityText = widgetStack.addText(currentGymCapacity.toString() + "%")

capacityText.font = Font.mediumRoundedSystemFont(50)

if (currentGymCapacity < 20) {
    capacityText.textColor = new Color("#33cc33")
} else if (currentGymCapacity < 30){
    capacityText.textColor = new Color("#ff9900")
}else{
    capacityText.textColor = new Color("#ff3300")
}

widgetStack.addSpacer(1)
	
const gymNameText = widgetStack.addText(gymName)
gymNameText.font = Font.regularSystemFont(12)

}

//Fetches the current capacity of the FitX gym
async function fetchGymDetails(id) {
const url = api + gymId
    const req = new Request(url)
    const result_json = await req.loadString()
    return JSON.parse(result_json)
}

Simplified version of this.

Studio Id can be obtained here https://fitx-proxy.daniel-stefan.dev