Need to write a javascript for PHP wesbite -- 2

Hi i need a developer to do a simple task . i have a website which is hosted in UK and have some coupon codes. i need a java script so that i can Redeem that coupon code which are of Brazil and sending the request such that server know that location is Brazil instead of UK . use OAuth v2 or any other suggestions are welcome Dont waste my time by bidding and then saying you cant do this .