我深入研究了API文檔并設法找到它.

// snip - include PayPal libraries and set up APIProfile object (variable: profile) -

$trans_search =& PayPal::getType('TransactionSearchRequestType');

// 01/12/201 as an example date, we always need a start date for the API

$start_date_str = '01/12/2011';

$start_time = strtotime($start_date_str);

$iso_start = date('Y-m-d\T00:00:00\Z', $start_time);

$trans_search->setStartDate($iso_start, 'iso-8859-1');

$invoice_ID = '10942456'; // here we insert the invoice ID we know

$trans_search->setInvoiceID($invoice_ID);

$caller =& PayPal::getCallerServices($profile);

$response = $caller->TransactionSearch($trans_search); // execute search

$ptsr = $response->getPaymentTransactions();

$nrecs = sizeof($ptsr);

$ack = $response->getAck();

if( ($ack != ACK_SUCCESS)

&& ($ack != ACK_SUCCESS_WITH_WARNING) )

exit; // jump out on error

if($nrecs == 1){ // check whether we found only one transaction (as expected)

$paymentTransaction = $ptsr[0];

// we found our transaction ID

$transID = $paymentTransaction->getTransactionID();

}else{

// invoice ID not unique?! :-(

exit('Found multiple transactions: '. print_r($ptsr, true)); // jump out

}

// snip - work with transaction ID -

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