Wordpress function for cronjob: put shortcode content from all pages into another ACF field

On my Wordpress website, all "pages" contain 2 ACF fields: price1 price2 price1 contains a shortcode that dynamically calls up an Amazon price. The output of price1 is to be stored in price2, e.g. price1 = [amazon asin="B00V9BKV5S" fields="new-price"] price2 = 329,00 I need a function that reads the shortcode from all "pages" of price1 and saves the output in price2. The function will be stored in the [login to view URL] of the plugin "Cronjob Scheduler" and there can be easily set up via the menu of the plugin. Here is the instruction: <?php /** * Cronjob Scheduler Include File * * This page allows you to create Cronjob Scheduler custom actions * through the WordPress admin. Actions can also be created within * theme files or other PHP files throughout your WordPress install. * * Do not edit this file unless you have a good understanding of PHP, * saving this with invalid code can render your WordPress install inoperable * until you can fix the issue using FTP or another file editing utility. **/ function my_cronjob_action () { // code to execute on cron run } add_action('my_cronjob_action', 'my_cronjob_action');