Stop non-approved users from logging in.

pmpro-approvals-login-example.php

<?php
/**
 * This is an example to stop non-approved user's from logging in using the Approvals Add On For Paid Memberships Pro.
 * Add this code below to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
function my_pmpro_stop_users_logging_in( $user, $password ) {
	
	$user_id = $user->ID;

	if( !empty( $user_id ) ) {

      $user_registered = strtotime( $user->user_registered );
      //All users that registered before 2024-01-16 23:59:59 will automatically be given access
      if( $user_registered < strtotime( '2024-01-16 23:59:59' ) ) {
         return $user;
      }
		   
      $level = pmpro_getMembershipLevelForUser( $user_id );
		
      if( function_exists( 'pmproec_isEmailConfirmationLevel' ) ) {
        	
         $is_confirmation = pmproec_isEmailConfirmationLevel( $level->ID );

         $validation_key = get_user_meta($user_id, "pmpro_email_confirmation_key", true);
            
			if ( ! empty( $validation_key ) || $validation_key !== 'validated' ) {
            $access = false;
         } else {
            $access = true;
         }

         if ( ! $access ) {
            return new WP_Error( 'not_approved', __( 'Your account is not approved yet.', 'pmpro' ) );
         }

      }

		// Get approval status
		if( class_exists( 'PMPro_Approvals') ) {

			$approval = PMPro_Approvals::getUserApproval( $user_id );
			// User currently does not need approval.

			if ( empty( $approval ) ) {
				return $user;
			}
			$approval_status = $approval['status'];
			if ( ( ! empty( $approval_status ) && $approval_status != 'approved' ) ) {
				$access = false;
			} else {
				$access = true;
			}
		}
	}

	if ( ! $access ) {
		return new WP_Error( 'not_approved', __( 'Your account is not approved yet.', 'pmpro' ) );
	}

	return $user;
}
add_filter( 'wp_authenticate_user', 'my_pmpro_stop_users_logging_in', 10, 2 );