Send order paid email as on-hold to processing notification

functions.php

<?php

add_action( 'woocommerce_email', 'my_child_setup_email_notification', 10, 1 );

function my_child_setup_email_notification( $mailer ) {
    $mails = $mailer->get_emails();
    if ( isset( $mails['WC_GZD_Email_Customer_Paid_For_Order'] ) ) {
        add_action( 'woocommerce_order_status_on-hold_to_processing_notification', array( $mails['WC_GZD_Email_Customer_Paid_For_Order'], 'trigger' ), 30 );
    }
}