load(
  local!testProcess,
  local!testparam: bind(
    get: local!testProcess,
    set: fn!startprocesswrite(
      processModelId:1494,  /* Process model id which you want to invoke */
      processParameters:_)),
       a!sectionLayout(
    label: "Lorem Ipsum",
    firstColumnContents: {
      a!buttonLayout(
        primaryButtons: {
          a!buttonWidget(
            label: "Start Process",
            value: true,
            saveInto: {local!testProcess,
            a!save(
              local!testparam,{
                param1: "test"     /* param1 is the process varible in the process model getting invoke */
              }
            )}
          )