Stop non-approved members from logging in and display a message when using the Approvals Add On

my_pmpro_stop_non_approved_members_logging_in.php

<?php
/**
 * Stop non-approved members from logging in and display a message when using the Approvals Add On
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 *
 */
function my_pmpro_stop_non_approved_members_logging_in( $user, $username, $password ) {

	// Bail if PMPro and PMPro Approvals aren't active.
	if ( ! function_exists( 'pmpro_getMembershipLevelForUser' ) || ! class_exists( 'PMPro_Approvals' ) ) {
		return $user;
	}

	if( $user instanceof WP_User ) {
		$user_id = $user->ID;
		$level = pmpro_getMembershipLevelForUser( $user_id );
		// Get approval status
		$approval = PMPro_Approvals::getUserApproval( $user_id );
		if ( ! empty( $approval['status'] ) && $approval['status'] != 'approved' ) {
			// Display error on WP default login page if member is not approved
			return new WP_Error( 'pending_approval', 'Your membership has not yet been approved.' ); 
		}
	}
	
	return $user;
}
add_filter( 'authenticate', 'my_pmpro_stop_non_approved_members_logging_in', 40, 3 );

function my_pmpro_login_pending_approval_message( $content ) {

	if( isset( $_GET['action'] ) && $_GET['action'] == 'pending_approval' ) {
		// Display alert on PMPro login page if member is not approved
		$html = '<div class="pmpro_message pmpro_alert">Your membership has not yet been approved.</div>';
		$content = $html . $content;
	}

	return $content;
}
add_filter( 'login_form_top', 'my_pmpro_login_pending_approval_message' );