Use of Action hook in wordpress to prepopulate form field - wordpress

Question

I'm new to wordpress actions and i'm trying two things.
I'm tying to output the data based on a action hook.
The documentation of the plugin only says the following:
6. Action eideasy_user_identified. Runs immediately after user data has been received and includes array of data returned by eID Easy.
Does anybody has a tip on how to output this data?
And even better how to use the output from this data to prepopulate form fields from another wordpress plugin.
I realy hope someone can help me or give me a example to get started.
Thank you

Answer 1

The plugin in the picture is eID Easy
Here's how you can log the data in a file:
Step 1: Create a file called log.txt
Step 2: Create a file called eid-log.php
Put the below code in the eid-log.php file:
<?php
/**
* eID LOG
*
* #package eID LOG
* #author Vinay
* #license gplv2-or-later
* #version 1.0.0
*
* #wordpress-plugin
* Plugin Name: eID LOG
* Plugin URI: https://stackoverflow.com/questions/73491338/use-of-action-hook-in-wordpress-to-prepopulate-form-field
* Description: Log the eID data in a file
* Version: 1.0.0
* Author: Vinay Jain
* Author URI: https://stackoverflow.com/users/17995563/vinay-jain
* Text Domain: eid-log
* Domain Path: /languages
* License: GPLv2 or later
* License URI: https://www.gnu.org/licenses/gpl-2.0.html
*
* You should have received a copy of the GNU General Public License
* along with Hot Recipes. If not, see <https://www.gnu.org/licenses/gpl-2.0.html/>.
*/
add_action('eideasy_user_identified', 'eid_log_to_file', 10, 1);
function eid_log_to_file($result){
if (!is_null($result)) {
$myfile = fopen(plugin_dir_path( __FILE__ )."log.txt", "w");
fwrite($myfile, "==================================");
fwrite($myfile, print_r($result, true));
fclose($myfile);
}
}
Step 3: Zip both the files and name it eid-log.zip, then go to Wp-admin > Plugins > Add new > Upload
Step 4. Activate the plugin and then use your eID Easy plugin.
Step 5: Read the log.txt file for the data.
This will log each entry in the log.txt file. This should work, if not then let me know.