"Paypal express checkout", not see any transactions in paypal account, although reture success code in program

Everything runs well, users are directed to paypal, commit the payment, and returns "SUCCESS" code and comes back to the merchant website. But when I log into the user account and merchant account, I can not see any transactions. None after several hours.

I am use 3nd party integration and sandbox testing. (I can send money directly from the sandbox accounts. )

Here are the strings.

METHOD] => SetExpressCheckout <p>
[VERSION] => 65.1 <p>
[PWD] => 13012.. <p>
[USER] => emily....<p>
[SIGNATURE] => AY-...<p>
[ADDRESSOVERRIDE] => 1 <p>
[L_NAME0] => 106791TBL3 <p>
[L_AMT0] => 18 <p>
[L_QTY0] => 1 <p>
[L_DESC0] => ...<p>
[MAXAMT] => 43 <p>
[AMT] => 18 <p>
[ITEMAMT] => 18<p> 
[CALLBACKTIMEOUT] => 4<p> 
[INSURANCEOPTIONOFFERED] => false<p> 
[ReturnUrl] => https://.. <p>
[CANCELURL] => https://..<p>开发者_StackOverflow中文版;
[CURRENCYCODE] => USD <p>
[PAYMENTACTION] => sale<p>

You should see transactions even in the sandbox environment, but you MUST log in as the test-merchant that you used in your settings, and you MUST log in in the sandbox environment.

Easiest way is to login with your developer account first, then list your test-accounts, select the merchant account and then click ad the end of the page "Enter sandbox site", that would give you a login prompt where you would enter the test-merchant password. If you don't know it, reset it from the developer site.

Check a mail message sent by IPN service – it should contain the “TransactionID” field – the identifier of the successfully submitted transaction.