Snippet to safely store PayPal API credentials

<?php
/*
This snippet stores PayPal API keys to the wp_options database table.
Useful if site is not running SSL but you can upload via encrypted FTP or SFTP.

For installation instructions, see here (use the mu-plugins method) - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
 */
function my_em_paypal_api_keys_save(){
    update_option('em_paypal_api', array (
        'username' => 'YOUR USERNAME',
        'password' => 'YOUR PASSWORD',
        'signature' => 'YOUR SIGNATURE',
    ));
}