Checkout, redirecting to a new site (PHP)

I need a solution (probably php).

I need a fast redirection from mainsite.com/checkout to newsite/checkout.com

EXAMPLE: Buyer purchase a service on mainsite.com and adds items and checkout. After chooseing the payment method and clicking on ''place order'', I want to have a redirection (in milliseconds) to newsite.com/checkout with the same data added (USD amount of the mainsite cart/checkout, and give the purchase a general name like ''JM Service Fee'')

Customer completes the payment (on the processor). and it goes back to newsite.com/checkout and in milliseconds back to mainsite.com confirming the order. The processor doesnt know the mainsite.

Hope you understand it.

Pls help what can I do?

I can help you with that
Add me up on skype: PavanBHW

I can do that for you if your both site are in wordpress, sent you PM , please check

Hi,

I can do, let me know if you still need someone to handle this job.

Thanks

it is easy. with just few codes. you need php and mysql knowledge