block3.js

import InAppBilling from "react-native-billing";

async purchase() {
  try {
    await InAppBilling.open();
    const details = await InAppBilling.purchase("android.test.purchased");
    console.log("You purchased: ", details);
  } catch (err) {
    console.log(err);
  } finally {
    await InAppBilling.close();
  }
}