I am encountering a strange issue with PayPal Express checkout. I have configured PayPal express checkout on website. Every thing is configured correctly as per my knowledge.
The problem I am facing is, When user pays using Express checkout he/she is successfully redirected to PayPal website and are allowed to pay.
After payment, when user is redirected back to Magento i am getting an error "Unable to initialize Express Checkout". However, the payment is already done and reflected in PayPal. Also, the order is being placed in Magento admin.
For better clarity, I have inserted below PayPal log
2016-01-08T08:16:27+00:00 DEBUG (7): Array ( [url] => https://api-3t.sandbox.paypal.com/nvp [SetExpressCheckout] => Array ( [PAYMENTACTION] => Sale [AMT] => 13.00 [CURRENCYCODE] => GBP [RETURNURL] => http://example.com/paypal/express/return/ [CANCELURL] => http://example.com/paypal/express/cancel/ [INVNUM] => WD400338 [SOLUTIONTYPE] => Sole [GIROPAYCANCELURL] => http://example.com/paypal/express/cancel/ [GIROPAYSUCCESSURL] => http://example.com/checkout/onepage/success/ [BANKTXNPENDINGURL] => http://example.com/checkout/onepage/success/ [LOCALECODE] => en_US [ITEMAMT] => 11.00 [TAXAMT] => 0.00 [SHIPPINGAMT] => 2.00 [L_NUMBER0] => BC19560 [L_NAME0] => Histazyme (Seasonal Support) [L_QTY0] => 1 [L_AMT0] => 11.00 [BUSINESS] => [NOTETEXT] => [EMAIL] => debra@yahoo.com [FIRSTNAME] => Debra [LASTNAME] => Morgan [MIDDLENAME] => [SALUTATION] => [SUFFIX] => [COUNTRYCODE] => GB [STATE] => [CITY] => london [STREET] => Deb 123 [ZIP] => WLQ123 [PHONENUM] => 123123123 [SHIPTOCOUNTRYCODE] => GB [SHIPTOSTATE] => [SHIPTOCITY] => london [SHIPTOSTREET] => Deb 123 [SHIPTOZIP] => WLQ123 [SHIPTOPHONENUM] => 123123123 [SHIPTOSTREET2] => [STREET2] => [SHIPTONAME] => Debra Morgan [ADDROVERRIDE] => 1 [METHOD] => SetExpressCheckout [VERSION] => 72.0 [USER] => **** [PWD] => **** [SIGNATURE] => **** [BUTTONSOURCE] => Magento_Cart_Enterprise ) [response] => Array ( [TOKEN] => EC-2B4844665V475563G [TIMESTAMP] => 2016-01-08T08:16:27Z [CORRELATIONID] => 88a03ff1aa3e2 [ACK] => Success [VERSION] => 72.0 [BUILD] => 18308778 ) [__pid] => 83882 ) 2016-01-08T08:16:47+00:00 DEBUG (7): Array ( [url] => https://api-3t.sandbox.paypal.com/nvp [GetExpressCheckoutDetails] => Array ( [TOKEN] => EC-2B4844665V475563G [METHOD] => GetExpressCheckoutDetails [VERSION] => 72.0 [USER] => **** [PWD] => **** [SIGNATURE] => **** [BUTTONSOURCE] => Magento_Cart_Enterprise ) [response] => Array ( [TOKEN] => EC-2B4844665V475563G [BILLINGAGREEMENTACCEPTEDSTATUS] => 0 [CHECKOUTSTATUS] => PaymentActionNotInitiated [TIMESTAMP] => 2016-01-08T08:16:47Z [CORRELATIONID] => f9828cb460e25 [ACK] => Success [VERSION] => 72.0 [BUILD] => 18308778 [EMAIL] => magentotester@gmail.com [PAYERID] => ET7PQY4WCM76N [PAYERSTATUS] => verified [FIRSTNAME] => Magento [LASTNAME] => Tester [COUNTRYCODE] => GB [SHIPTONAME] => Debra Morgan [SHIPTOSTREET] => Deb 123 [SHIPTOCITY] => london [SHIPTOZIP] => WLQ123 [SHIPTOCOUNTRYCODE] => GB [SHIPTOPHONENUM] => 123123123 [SHIPTOCOUNTRYNAME] => United Kingdom [ADDRESSSTATUS] => Confirmed [CURRENCYCODE] => GBP [AMT] => 13.00 [ITEMAMT] => 11.00 [SHIPPINGAMT] => 2.00 [HANDLINGAMT] => 0.00 [TAXAMT] => 0.00 [INVNUM] => WD400338 [INSURANCEAMT] => 0.00 [SHIPDISCAMT] => 0.00 [L_NAME0] => Histazyme (Seasonal Support) [L_NUMBER0] => BC19560 [L_QTY0] => 1 [L_TAXAMT0] => 0.00 [L_AMT0] => 11.00 [L_ITEMWEIGHTVALUE0] => 0.00000 [L_ITEMLENGTHVALUE0] => 0.00000 [L_ITEMWIDTHVALUE0] => 0.00000 [L_ITEMHEIGHTVALUE0] => 0.00000 [PAYMENTREQUEST_0_CURRENCYCODE] => GBP [PAYMENTREQUEST_0_AMT] => 13.00 [PAYMENTREQUEST_0_ITEMAMT] => 11.00 [PAYMENTREQUEST_0_SHIPPINGAMT] => 2.00 [PAYMENTREQUEST_0_HANDLINGAMT] => 0.00 [PAYMENTREQUEST_0_TAXAMT] => 0.00 [PAYMENTREQUEST_0_INVNUM] => WD400338 [PAYMENTREQUEST_0_INSURANCEAMT] => 0.00 [PAYMENTREQUEST_0_SHIPDISCAMT] => 0.00 [PAYMENTREQUEST_0_INSURANCEOPTIONOFFERED] => false [PAYMENTREQUEST_0_SHIPTONAME] => Debra Morgan [PAYMENTREQUEST_0_SHIPTOSTREET] => Deb 123 [PAYMENTREQUEST_0_SHIPTOCITY] => london [PAYMENTREQUEST_0_SHIPTOZIP] => WLQ123 [PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE] => GB [PAYMENTREQUEST_0_SHIPTOPHONENUM] => 123123123 [PAYMENTREQUEST_0_SHIPTOCOUNTRYNAME] => United Kingdom [PAYMENTREQUEST_0_ADDRESSSTATUS] => Confirmed [L_PAYMENTREQUEST_0_NAME0] => Histazyme (Seasonal Support) [L_PAYMENTREQUEST_0_NUMBER0] => BC19560 [L_PAYMENTREQUEST_0_QTY0] => 1 [L_PAYMENTREQUEST_0_TAXAMT0] => 0.00 [L_PAYMENTREQUEST_0_AMT0] => 11.00 [L_PAYMENTREQUEST_0_ITEMWEIGHTVALUE0] => 0.00000 [L_PAYMENTREQUEST_0_ITEMLENGTHVALUE0] => 0.00000 [L_PAYMENTREQUEST_0_ITEMWIDTHVALUE0] => 0.00000 [L_PAYMENTREQUEST_0_ITEMHEIGHTVALUE0] => 0.00000 [PAYMENTREQUESTINFO_0_ERRORCODE] => 0 ) [__pid] => 4730 ) 2016-01-08T08:16:50+00:00 DEBUG (7): Array ( [url] => https://api-3t.sandbox.paypal.com/nvp [DoExpressCheckoutPayment] => Array ( [TOKEN] => EC-2B4844665V475563G [PAYERID] => ET7PQY4WCM76N [PAYMENTACTION] => Sale [AMT] => 13.00 [CURRENCYCODE] => GBP [BUTTONSOURCE] => Magento_Cart_Enterprise [NOTIFYURL] => http://example.com/paypal/ipn/ [RETURNFMFDETAILS] => 1 [ITEMAMT] => 11.00 [TAXAMT] => 0.00 [SHIPPINGAMT] => 2.00 [L_NUMBER0] => BC19560 [L_NAME0] => Histazyme (Seasonal Support) [L_QTY0] => 1 [L_AMT0] => 11.00 [METHOD] => DoExpressCheckoutPayment [VERSION] => 72.0 [USER] => **** [PWD] => **** [SIGNATURE] => **** ) [response] => Array ( [TOKEN] => EC-2B4844665V475563G [SUCCESSPAGEREDIRECTREQUESTED] => false [TIMESTAMP] => 2016-01-08T08:16:50Z [CORRELATIONID] => ca2bf8e5aa456 [ACK] => Success [VERSION] => 72.0 [BUILD] => 18308778 [TRANSACTIONID] => 7S516206DM871681U [TRANSACTIONTYPE] => cart [PAYMENTTYPE] => instant [ORDERTIME] => 2016-01-08T08:16:50Z [AMT] => 13.00 [FEEAMT] => 0.64 [TAXAMT] => 0.00 [CURRENCYCODE] => GBP [PAYMENTSTATUS] => Completed [PENDINGREASON] => None [REASONCODE] => None [PROTECTIONELIGIBILITY] => Eligible [INSURANCEOPTIONSELECTED] => false [SHIPPINGOPTIONISDEFAULT] => false [PAYMENTINFO_0_TRANSACTIONID] => 7S516206DM871681U [PAYMENTINFO_0_TRANSACTIONTYPE] => cart [PAYMENTINFO_0_PAYMENTTYPE] => instant [PAYMENTINFO_0_ORDERTIME] => 2016-01-08T08:16:50Z [PAYMENTINFO_0_AMT] => 13.00 [PAYMENTINFO_0_FEEAMT] => 0.64 [PAYMENTINFO_0_TAXAMT] => 0.00 [PAYMENTINFO_0_CURRENCYCODE] => GBP [PAYMENTINFO_0_PAYMENTSTATUS] => Completed [PAYMENTINFO_0_PENDINGREASON] => None [PAYMENTINFO_0_REASONCODE] => None [PAYMENTINFO_0_PROTECTIONELIGIBILITY] => Eligible [PAYMENTINFO_0_PROTECTIONELIGIBILITYTYPE] => ItemNotReceivedEligible,UnauthorizedPaymentEligible [PAYMENTINFO_0_SECUREMERCHANTACCOUNTID] => PHSYBBA6RW3LS [PAYMENTINFO_0_ERRORCODE] => 0 [PAYMENTINFO_0_ACK] => Success ) [__pid] => 4730 ) 2016-01-08T08:16:53+00:00 DEBUG (7): Array ( [ipn] => Array ( [address_city] => london [address_country] => United Kingdom [address_country_code] => GB [address_name] => Debra Morgan [address_state] => [address_status] => confirmed [address_street] => Deb 123 [address_zip] => WLQ123 [charset] => windows-1252 [custom] => [first_name] => Magento [invoice] => WD400338 [ipn_track_id] => ca2bf8e5aa456 [item_name1] => Histazyme (Seasonal Support) [item_number1] => BC19560 [last_name] => Tester [mc_currency] => GBP [mc_fee] => 0.64 [mc_gross] => 13.00 [mc_gross_1] => 11.00 [mc_handling] => 0.00 [mc_handling1] => 0.00 [mc_shipping] => 2.00 [mc_shipping1] => 0.00 [notify_version] => 3.8 [num_cart_items] => 1 [payer_email] => magentotester@gmail.com [payer_id] => ET7PQY4WCM76N [payer_status] => verified [payment_date] => 00:16:50 Jan 08, 2016 PST [payment_fee] => [payment_gross] => [payment_status] => Completed [payment_type] => instant [protection_eligibility] => Eligible [quantity1] => 1 [receiver_email] => magentok.testing@gmail.com [receiver_id] => PHSYBBA6RW3LS [residence_country] => GB [tax] => 0.00 [tax1] => 0.00 [test_ipn] => 1 [transaction_subject] => [txn_id] => 7S516206DM871681U [txn_type] => cart [verify_sign] => A.CSYz4u5IILQm5wM0J0JbJiIcEuA.7y2YZiar13z4m9ajJ1-KMo9qb- ) [postback_to] => https://www.sandbox.paypal.com/cgi-bin/webscr [__pid] => 78225 )