PayPal DoVoid功能不是空洞

I have a dovoid function I've taken from various tutorials for the classic api (the rest of our site uses the classic api, so I'm stuck using it until i can gut the thing and use the better apis). The function appears to execute and I am not getting error messages, but I am not seeing the transactions voided in the sandbox.

Here is the dovoid function:

public function DoVoid($auth_id,$note)
{
    $xml = '<?xml version="1.0" encoding="UTF-8"?>'.
        ENV:Envelope
        xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"
        xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
        xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
        xmlns:xsd="http://www.w3.org/1999/XMLSchema"
        SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
        '.
        '<SOAP-ENV:Header>
        '.
        '<RequesterCredentials
        xmlns="urn:ebay:api:PayPalAPI"
        SOAP-ENV:mustUnderstand="1">
        '.
        '<Credentials xmlns="urn:ebay:apis:eBLBaseComponents">
        '.
        '<Username>'.utf8_encode($PayPalApiUsername).'</Username> '.
        '<Password>'.utf8_encode($PayPalApiPassword).'</Password> '.
        '<Subject>'.utf8_encode("Voiding Transaction").'</Subject>'.
        '
        </Credentials>'.
        '
        </RequesterCredentials>'.
        '
        </SOAP-ENV:Header>'.
        '<SOAP-ENV:Body>
        '.
        '<DoVoidReq xmlns="urn:ebay:api:PayPalAPI">
        '.
        '<DoVoidRequest xmlns="urn:ebay:api:PayPalAPI">
        '.
        '<Version xmlns="urn:ebay:apis:eBLBaseComponents"                    
        xsi:type="xsd:string">60.0</Version>'.
        '<AuthorizationID>'.utf8_encode($auth_id).'</AuthorizationID>'.
        '<Note>'.utf8_encode($note).'</Note>'.
        '
        </DoVoidRequest>'.
        '
        </DoVoidReq>'.
        '
        </SOAP-ENV:Body>'.
        '
        </SOAP-ENV:Envelope>';
    //send query
    $response = $this->sendQuery($xml);
    if ($response)
    {
        //check XML response data
        if (isset($response["SOAP-ENV:Envelope"][0]["SOAP-ENV:Body"][0]["DoVoidResponse"][0]))
        {
            $a = $response["SOAP-ENV:Envelope"][0]["SOAP-ENV:Body"][0]["DoVoidResponse"][0];
            //check is there transaction error
            if (isset($a["Errors"]))
            {
                $this->is_error = true;
                foreach ($a["Errors"] as $key=>$value)
                {
                $this->error_messages[] = $value["ShortMessage"][0].(trim($value["ShortMessage"][0])!=trim($value["LongMessage"][0])?(" - ".$value["LongMessage"][0]):"");
                }
                return $this->error_messages;
            }
            //potentially all is good
            else
            {
                $this->PaymentAction = $a;
                //check tocken is the same as sent
                if ($a["Ack"][0] == "Success")
                {
                    if (isset($a["AuthorizationID"][0]))
                    {
                        //return payment data
                        return $a["AuthorizationID"][0];
                    }
                }
                else
                {
                    $this->is_error = true;
                    $this->error_messages[] = "Incorrect transaction status";
                    return false;
                }
            }
        }
    }
}

Now one thing I am not sure of (since I just started using this API) is what the authorization ID should look like. Currently, the ones I am pulling from elsewhere in our system start with "ec_" which I don't think is correct. What should these authorization ids look like for voiding?

What I am trying to do is void an authorization when the order's values change, as we have had a lot of trouble with people getting multiple pending transactions because they change their order, reauthorize, and our system gets confused. While I am trying to fix the larger structural problems, I need this as a short term fix so we only have one active authorization per order.

In order to void an authorization you will need to reference it's transaction ID. The string that begins with "EC" is the secure token. A PayPal transaction ID contains 16 alphanumeric characters, for example 5DE44868BF3911546.