Givbux Sample project, test the cordova-plugin-contacts with ionic 4, for testing purpose, this is not a serious project.
ionic cordova plugin add cordova-plugin-contacts npm install @ionic-native/contacts
https://ionicframework.com/docs/native/contacts
https://.com/apache/cordova-plugin-contacts https://cordova.apache.org/docs/en/7.x/reference/cordova-plugin-contacts/index.html