wpmem_exp_expired_msg

/**
 * This example changes the default message if the
 * user's account has expired.
 */
add_filter( 'wpmem_exp_expired_msg', 'my_expired_msg' );
function my_expired_msg( $msg ) {
    if ( strpos( $msg, 'Your account has expired.' ) !== false ) {
        $msg = 'Your account has expired. Please renew in
            the user settings area.';
    }

    // return the message, filtered or unfiltered
    return $msg;
}


/**
 * This example creates an entirely new message based on the
 * user's payment status (pending or expired).
 */
add_filter( 'wpmem_exp_expired_msg', 'my_expired_msg2' );
function my_expired_msg2( $msg ) {
    $user_id = get_current_user_id();
    $msg = '<div class="wpmem_msg" align="center">';
    if ( get_user_meta( $user_id, 'exp_type', true ) === 'pending' ) {
        $msg .= '<p><b>This content is for subscribers only.</b><br />';
        $msg .= 'Once the payment process is complete you will have access to premium members only content.';
        $msg .= '</p>';
        $msg.= wpmem_payment_button(); 
    } else {
        $msg .= '<p><b>Your subscription has expired.</b></p>';
        $msg .= '<p>Please <a href="' .   wpmem_profile_url( 'renew' ) . '">renew your subscription now</a>.</p>';
    }
    $msg.= '</div>';
    return $msg;
}