How do I send webform submission data to a google sheet? I have implemented the webform module on my Drupal 8.4 site. I have some forms that I would like to submit the data to a google spreadsheet, instead of the drupal database. 

Can someone help me get started with this? 
Do I need to create a custom module to implement this functionality? What hooks do I need to use? Is there any documentation/tutorials out there on how to do this?
Right now the only available solution is to use Zapier.

Ivan Zugec did a great screencast showing How to Create Forms using Webform and Contact in Drupal 8 and includes a demo showing how to push webform submissions into a Google Sheet using Zapier.

Hopefully, someone will port the Webform to Google Docs module from D7 to D8.