The service of goo.gl will be not available for the anonymous and new users from the 13 April 2018 but existing user can access these service for another 1 year. It will completely shut down on March 30th, 2019.
if you are currently using the URL Shortener APIs to manage all your goo.gl short links, then you can continue using till the time it completely discontinued on March 30, 2019
For the more detials: Transitioning Google URL Shortener to Firebase Dynamic Links
Prem Tiwari is the founder of FreeWebMentor.com and also a professional developer who has vast experience in PHP and open source technologies. Apart from this, he is a blogger by hobby and also he has been a regular speaker of WordPress sessions in various IT Companies. View all posts by Prem Tiwari