Redirect old members to the membership account page on login.

redirect-old-members-to-membership-account.php

<?php
/**
 * Redirect old members to the membership account page on login.
 *
 * 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_login_redirect_old_members_to_membership_account( $redirect_to, $request, $user ) {

	// Is PMPro active?
	if ( ! function_exists( 'pmpro_url' ) ) {
		return $redirect_to;
	}

	// Redirect old members to the membership account page.
	if ( ! pmpro_hasMembershipLevel() && ! empty( pmpro_getMembershipLevelsForUser( $user->ID, true ) ) ) {
		$redirect_to = pmpro_url( 'account' );
	}

	return $redirect_to;
}
add_filter( 'login_redirect', 'my_login_redirect_old_members_to_membership_account', 10, 3 );