Display a banner that notifies users about their upcoming expiration - Memberlite method.

memberlite-banner-expiration-notification.php

<?php
/**
 * This code will display a renewal reminder notification banner at the top of your website for members whose membership
 * level will expire within 7 days of the date they visit your site.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * Note: When adding to your Customizations Plugin, be careful not to include the opening php tag on line 1 above.
 */

function memberlite_show_banner_renewal_message(){
	global $pmpro_pages;

	// Bail early if the current user does not have a membership level.
	if ( ! pmpro_hasMembershipLevel() ) {
		return;
	}

	// Load custom CSS for banner.
	?>
		<style>
			.pmpro_banner_renewal_wrapper h4 {
				color: white;
				margin: 0;
				padding: 1rem;
				text-align: center;
			}
			.pmpro_banner_renewal_wrapper a {
				color: white;
				text-decoration: underline;
			}
			.pmpro_banner_renewal_wrapper a:hover {
				color: rgba(255,255,255,0.8);
			}
		</style>
	<?php

	$user_id = get_current_user_id();
	$level = pmpro_getMembershipLevelForUser( $user_id );

	// Bail if this is the checkout page.
	if ( is_page( $pmpro_pages['checkout'] ) ) {
		return;
	}

	// Bail if the user does not have an enddate set.
	if ( empty( $level->enddate ) ) {
		return;
	}
	
	$today = time();

	// if today is more than 7 days before enddate, bail.
	if ( $today <= strtotime( '- 7 days', $level->enddate ) ) {
		return;
	}

	$message = 'Your ' . $level->name . ' membership will expire soon. <a href="' . pmpro_url( "checkout", "?level=" . $level->id ) . '"> Click here to renew membership.</a>';

	echo '<div class="pmpro_banner_renewal_wrapper banner banner_secondary"><h4> ' . $message . ' </h4></div>';
}
add_action( 'before_page', 'memberlite_show_banner_renewal_message' );

This recipe is included in the blog post on "Add a customized notification banner to alert your members of upcoming expiration." at Paid Memberships Pro here: https://www.paidmembershipspro.com/add-a-customized-notification-banner-to-alert-your-members-of-upcoming-expiration/