llms-cert-course-title-code.php

<?php // don't copy this to functions.php file
/**
 * Add custom merge codes to an LLMS certificate
 * @param    int   $user_id          WP_User ID
 * @param    int   $cert_id          WP_Post ID of the generated certificate
 * @param    int   $related_post_id  WP_Post ID of the post which triggered the certificate generation
 * @return   void
 */
function my_custom_cert_merge_codes( $user_id, $cert_id, $related_post_id ) {
		
	$cert_post = get_post( $cert_id );
	$content = str_replace( '{course_title}', get_the_title( $related_post_id ), $cert_post->post_content );
	wp_update_post( array(
		'ID' => $cert_id,
		'post_content' => $content
	) );
}
add_action( 'llms_user_earned_certificate', 'my_custom_cert_merge_codes', 999, 3 );

llms-cert-custom-merge-example.php

<?php // don't copy this to functions.php file
/**
 * Add custom merge codes to an LLMS certificate
 * @param    int   $user_id          WP_User ID
 * @param    int   $cert_id          WP_Post ID of the generated certificate
 * @param    int   $related_post_id  WP_Post ID of the post which triggered the certificate generation
 * @return   void
 */
function my_custom_cert_merge_codes( $user_id, $cert_id, $related_post_id ) {
		
	$cert_post = get_post( $cert_id );

	$content = str_replace( '{your_merge_code}', get_user_meta( $user_id, 'your_user_meta_key', true ), $cert_post->post_content );

	wp_update_post( array(
		'ID' => $cert_id,
		'post_content' => $content
	) );

}
add_action( 'llms_user_earned_certificate', 'my_custom_cert_merge_codes', 999, 3 );

llms-cert-student-id-code.php

<?php // don't copy this to functions.php file
/**
 * Add custom merge codes to an LLMS certificate
 * @param    int   $user_id          WP_User ID
 * @param    int   $cert_id          WP_Post ID of the generated certificate
 * @param    int   $related_post_id  WP_Post ID of the post which triggered the certificate generation
 * @return   void
 */
function my_custom_cert_merge_codes( $user_id, $cert_id, $related_post_id ) {
		
	$cert_post = get_post( $cert_id );

	$content = str_replace( '{student_id}', $user_id, $cert_post->post_content );

	wp_update_post( array(
		'ID' => $cert_id,
		'post_content' => $content
	) );

}
add_action( 'llms_user_earned_certificate', 'my_custom_cert_merge_codes', 999, 3 );

Hi, I´m interested in use the files to my wordpress, but I don´t know about where located this file
Please help me about

Hey @lkchamorro

These hooks would be added to your site, probably via a functions.php file in a child theme. See WP core docs for more info: https://developer.wordpress.org/reference/functions/add_action/