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I have designed a store using PayPal Express Checkout. They have recently decided that they want separate shipping rates for local and international orders. I am currently pulling all shipping information from PayPal. Is it possible to send the total to PayPal AFTER receiving the buyer’s shipping information?
What you want is the PayPal Instant Update / Callback API.
This is a callback from PayPal to your website to prepopulate shipping options on the PayPal website while the buyer is doing the checkout on PayPal.
It allows you to specify the specific shipping cost for the transaction after the SetExpressCheckout API has already been called.
How the Express Checkout flow would work with Instant Update / Callback implemented:
See “Setting up the Callback” on https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECInstantUpdateAPI for detailed instructions.
This page also includes an example API call and an example response for the callback; the response your callback file should return.
Let me know if anything is not clear and I’ll try to hunt for some example files.
Note: In Live mode, the callback URL on your site must be SSL-secured (HTTPS). In Sandbox you can use both HTTP and HTTPS.