Populate Woocommerce short_description field with other fields

Add question

Username* Please type your username .

E-Mail* Please type your E-Mail .

Question Title* Please choose an appropriate title for the question to answer it even easier .

Category Please choose the appropriate category so others can easily search your question.

Tags Please choose suitable Keywords Ex : question , poll .

Poll This question is a poll ? If you want to be doing a poll click here .

Featured image

Browse

Details*

Ask Anonymously Anonymous asks

Video description Do you need a video to description the problem better ?

Video type Choose from here the video type .

Video ID Put here the video id : https://www.youtube.com/watch?v=sdUUx5FdySs EX : 'sdUUx5FdySs'.

Notified Notified by e-mail at incoming answers.

Terms* By asking your question, you agree to the Terms of Service and Privacy Policy.

Captcha*

Populate Woocommerce short_description field with other fields

Question

I need to populate the short_description field with data saved in other fields/custom product attributes.
One tricky part is that the short_description field (which comes from the post excerpt I believe) needs to be updated in the database.

Why? Because I’m exporting products to a Facebook shop (using Facebook for Woocommerce plugin) and the only info available (apart from price/title) comes from this field.

This thread seems to indicate how to update and save data in this field, but I don’t know where to put this code. Would help to know how to use this in functions.php

How to change / delete product short description in Woocommerce