Google has applied a new pricing model for Maps, Routes, and Places on July 16, 2018, it now requires filling in payment information. Without this data, the Google Maps published on your website may return the following error:
This page can't load Google Maps Correctly.
Do you own this website?
Note, that using Google Maps on your website will not charge you unless your site has quite large traffic. Additionally, Google will provide you with $300 credit for free, which will be spent as you use Maps, Routes, and Places on your websites.