add_action( ‘publish_pelicula’, ‘post_published_notification’, 10, 2 ); does not trigger propperly

Well let’s compare the hook to one that is working:

add_action( 'admin_init', array( $this, 'page_init' ) );
add_action( 'publish_pelicula', 'post_published_notification', 10, 2 );

page_init() and post_published_notification() are both methods of the MySettingsPage class, but you’ve set the action callbacks for each of them differently.

The second argument for add_action() is a callback. It tells WordPress/PHP which function to run when the action is fired. For an action to call a class method, you need to pass an array:

A method of an instantiated object is passed as an array containing an
object at index 0 and the method name at index 1.

Since you’re running add_action inside a class, the object in question is $this, and the method name is post_published_notification. You’ve done this correctly for page_init, so you just need to do that same for post_published_notification:

add_action( 'publish_pelicula', array( $this, 'post_published_notification' ), 10, 2 );

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