Question

we are currently developing a payment proxy, so our clients can implement our payment system in their shop and we handle all the interfaces to paypal and other payment options,
e.g
the users selects paypal as payment options and clicks on the link in the clients shop, the shop sends the cart to our proxy and then gets redirected to paypal.
so
user clicks “buy with paypal” -> proxy -> paypal
he pays and the confirmation goes
paypal -> proxy -> client web shop,

the problem is, the user should not notice the proxy, he should get directly redirectet to paypal,
how can we do this (redirect with posts)? paypal needs posts so we cant use php’s header functions as they don’t support posts, and we cant use fsock because paypal would then be open on our proxy….

Answer 1

You can make AJAX query to your proxy, proxy returns parameters for Paypal, then JavaScript will build new form that submits to Paypal with parameters received from proxy and will submit this automatically.