I am currently implementing Paypal's express checkout using JAVA, interfacing with the PayPal NVP API. I have SetExpressCheckout, GetExpressCheckoutDetails, DoExpressCheckout, DoAuthorization and DoCapture methods all working. However, I need to implement the Instant Update API in order to calculate shipping costs and taxes on our server and display in paypal's page. I followed all the steps and recommendations, however, the callback is never called. I have tried playing with the setExpressCheckout parameters as I read in this forum that those parameters could be the problem but couldn't make it work yet. When I log in or change shipping addresses the callback is never called, I'm in sandbox environment BTW.
My callback url is public and works properly. When trying with a webbrowser it invokes my payPalCheckoutUpdate method and writes in a log file in my server, so I'm positive that the url was called. The problem is that when I log in paypal's checkout mobile site or change shipping address this callback url is never called.
My paypal update method is hosted in an Apache Ofbiz based application, I found in different forums that paypal can't access ofbiz's urls in port 8443 or 8080. So I used apache to redirect from my callback URL to my actual method and avoid using a port different than 80 in the callback url. (this works fine when tested with a webbrowser)
This is my call to setExpressCheckout without the credentials (let me know if you see a problem in this call)
372623 [http-0.0.0.0-8443-3] INFO com.paypal.sdk.core.nvp.NVPAPICaller - L_SHIPPINGOPTIONAMOUNT0=0.00&CANCELURL=https%3A%2F%2Fdev2.XXXjacker.com%3A8443%2FXXXjacker%2Fcontrol%2FpayPalCheckoutCancel&MAXAMT=80.99&L_SHIPPINGOPTIONLABEL0=Calculated+Offline&AMT=80.99&RETURNURL=https%3A%2F%2Fdev2.XXXjacker.com%3A8443%2FXXXjacker%2Fcontrol%2FpayPalCheckoutReturn&CALLBACK=http%3A%2F%2Fdev2.XXXjacker.com%2FpayPalCheckoutUpdate&L_SHIPPINGOPTIONISDEFAULT0=true&L_AMT0=80.99&TAXAMT=0.00&L_QTY0=1&L_NUMBER0=286202&SHIPPINGAMT=0.00&L_NAME0=DVD+%2B+VCR+w%2F+Line+in+%28no+tuner%29&ITEMAMT=80.99&CALLBACKVERSION+=84.0&VERSION=84.0&L_SHIPPINGOPTIONNAME0=Calculated+Offline&CALLBACKTIMEOUT=3&METHOD=SetExpressCheckout&CURRENCYCODE=USD&PWD=**&SOURCE=PAYPAL_JAVA_SDK_76.0&SIGNATURE=****&USER=xxxxx_12xxxx643_biz_api1.xxxxxxxxxxxxx.com
I tried with and without L_SHIPPINGOPTIONLABEL0 parameter, and also tried with version and callbackversion set to 76.0 (the default set by the java library I'm using, taken from paypal) I always get the same result, the callback url isn't invoked.
And this is the response from paypal:
373536 [http-0.0.0.0-8443-3] INFO com.paypal.sdk.core.nvp.NVPAPICaller - TOKEN=EC%2dXXXXXXXX03911650G&TIMESTAMP=2012%2d06%2d12T22%3a03%3a06Z&CORRELATIONID=f1e3c64211d5e&ACK=Success&VERSION=84%2e0&BUILD=2975009 Ack : 200 Elapsed Time : 914 ms
Thank you in advance for your assistance in this matter.
