how to create approval and declination process from email using google apps script

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i need help with creation of approval and declination from within email created using app script, the html code

<div align= "center" dir="rtl">   <p><strong><a style="color:
#97bf0d;" href="<?= body.approval_url ?>" method="GET">accept</a></strong> or <strong><a style="color:#e95f47;"
href="<?= body.reject_url ?>" method="GET">decline</a></strong></p>
</div> </font> </div>

i am searching for a function to handle this within google app script that sends a reply from html and update google sheet with the request status