my-pmpro-members-card-email.php

<?php   // do not copy this line.
/**
 * Show member email address and WordPress User ID on Membership Card.
 * Requires the Membership Card 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_show_member_email_and_id_on_card( $user ) {
    // Only show if the user has at least one membership level.
    if ( ! pmpro_hasMembershipLevel( '', $user->ID ) ) {
        return;
    }

    // Display email address.
    echo '<p><strong>Email:</strong> ' . esc_html( $user->user_email ) . '</p>';

    // Display WordPress User ID.
    echo '<p><strong>Member ID:</strong> ' . intval( $user->ID ) . '</p>';
}
add_action( 'pmpro_membership_card_after_card', 'my_show_member_email_and_id_on_card' );