Write some Software - cookies very important!

i need this php-proxy to work for only one website the site saves the ip address when i login for the first time it ask me to confirm the ip with a sms text code then the second time i access it with the same ip i can access the page without the sms i want to use the php-proxy scripy to access it from my domain with the domain ip address but the website homeaway is using the cookies to detect the device i login from and when i use a new device it asks me to confirm the login with a sms code after i confirm it then the second time i can use the same device without the sms code and i need this to work directly for a domain ip so i can give the link to my clients so they can use the same login details without sms code