This is a groovy file to connect google sheet API and read data from googlesheet. https://medium.com/appgambit/integrating-google-sheet-with-katalon-studio-f72936511c27

ReadSpreadsheet.groovy

package com.java.utilily
import static com.kms.katalon.core.checkpoint.CheckpointFactory.findCheckpoint
import static com.kms.katalon.core.testcase.TestCaseFactory.findTestCase
import static com.kms.katalon.core.testdata.TestDataFactory.findTestData
import static com.kms.katalon.core.testobject.ObjectRepository.findTestObject

import com.google.api.client.util.store.FileDataStoreFactory
import com.kms.katalon.core.annotation.Keyword
import com.kms.katalon.core.checkpoint.Checkpoint
import com.kms.katalon.core.checkpoint.CheckpointFactory
import com.kms.katalon.core.mobile.keyword.MobileBuiltInKeywords
import com.kms.katalon.core.model.FailureHandling
import com.kms.katalon.core.testcase.TestCase
import com.kms.katalon.core.testcase.TestCaseFactory
import com.kms.katalon.core.testdata.TestData
import com.kms.katalon.core.testdata.TestDataFactory
import com.kms.katalon.core.testobject.ObjectRepository
import com.kms.katalon.core.testobject.TestObject
import com.kms.katalon.core.webservice.keyword.WSBuiltInKeywords
import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords

import MobileBuiltInKeywords as Mobile
import WSBuiltInKeywords as WS
import WebUiBuiltInKeywords as WebUI

import org.openqa.selenium.WebElement
import org.openqa.selenium.WebDriver
import org.openqa.selenium.By

import com.kms.katalon.core.testobject.RequestObject
import com.kms.katalon.core.testobject.ResponseObject
import com.kms.katalon.core.testobject.ConditionType
import com.kms.katalon.core.testobject.TestObjectProperty

import com.kms.katalon.core.mobile.helper.MobileElementCommonHelper
import com.kms.katalon.core.util.KeywordUtil

import com.kms.katalon.core.webui.exception.WebElementNotFoundException

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.sheets.v4.Sheets;
import com.google.api.services.sheets.v4.SheetsScopes;
import com.google.api.services.sheets.v4.model.ValueRange;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;

class ReadSpreadsheet {
	private static final String APPLICATION_NAME = "< Application Name of Google API >";
	private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
	private static final String TOKENS_DIRECTORY_PATH = "tokens";

	private static final List<String> SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY);
	private static final String CREDENTIALS_FILE_PATH = "< Your client_secret.json file path >";

	private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
		// Load client secrets.
		InputStream in1 = ReadSpreadsheet.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
		if (in1 == null) {
			throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
		}
		GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in1));

		// Build flow and trigger user authorization request.
		GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
				clientSecrets, SCOPES)
				.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
				.setAccessType("offline").build();
		LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8889).build();
		return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
	}


	@Keyword
	public static List<List<Object>> getSpreadSheetRecords(String range) throws IOException, GeneralSecurityException {
		// Build a new authorized API client service.
		final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
		final String spreadsheetId = "< Your google sheet ID >";

		Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
				.setApplicationName(APPLICATION_NAME).build();
		ValueRange response = service.spreadsheets().values().get(spreadsheetId, range).execute();
		List<List<Object>> values = response.getValues();
		if (values == null || values.isEmpty()) {
			System.out.println("No data found.");
			return null;
		} else {
			return values;
		}
	}
}