How to use the usabilla-react-native.initialize function in usabilla-react-native

constructor() {
    super()
    this.state = {text: ''}
    usabilla.initialize("YOUR_APP_ID_HERE")
    usabilla.setDataMasking(usabilla.getDefaultDataMasks(), 'X');
    var customVars = {"test": 1};
    usabilla.setCustomVariables(customVars);
    usabilla.setFormDidLoadSuccessfully((reminder) => console.log("successfull loading form: ", reminder));
    usabilla.setFormDidFailLoading((reminder) => console.log("Error loading form: ", reminder));
    usabilla.setFormDidClose((reminder) => console.log("Form closed: ", reminder));
    usabilla.setCampaignDidClose((reminder) => console.log("Campaign closed: ",JSON.stringify(reminder)))
  }