Why I am getting `This page can't load Google Maps correctly.` and `For development purpose only` sentences in Google Map of Contact Us page of Magento 1 ?
Hello @foysal
The issue is more related to google map API key - you will require to generate and add/configured your google map API key into magento configurations.
I would suggest you to refer below links for more details :
https://www.templatemonster.com/help/magento-troubleshooter-google-maps-not-show-api-key-issue.html
https://churchthemes.com/page-didnt-load-google-maps-correctly/
Hope it helps !