Php Paypal快速结账与并行支付

我正在使用Paypal ExpressCheckout方法进行付款。我需要加强我的支付，就像使用平行支付的快速结帐支付多个商户一样。我已经完成了教程。当我提交时，我得到了错误。我发送的数据是

&METHOD=SetExpressCheckout
&RETURNURL=http%3A%2F%2Fwww.mydomain.net%2Fpaypal_process.php
&CANCELURL=http%3A%2F%2Fwww.mydomain.net%2Fcancel.php
&PAYMENTREQUEST_0_CURRENCYCODE=SGD
&PAYMENTREQUEST_0_AMT=50
&PAYMENTREQUEST_0_ITEMAMT=50
&PAYMENTREQUEST_0_SELLERPAYPALACCOUNTID=email@mydomain.com.sg
&PAYMENTREQUEST_0_PAYMENTACTION=Sale
&PAYMENTREQUEST_0_PAYMENTREQUESTID=CART26488-PAYMENT0
&L_PAYMENTREQUEST_0_NAME0=Depart San Jose Feb 12 at 12:10PM Arrive in Baltimore at 10:22PM
&L_PAYMENTREQUEST_0_NUMBER0=Flight 522
&L_PAYMENTREQUEST_0_QTY0=1
&L_PAYMENTREQUEST_0_AMT0=50
&L_PAYMENTREQUEST_0_DESC0=SJC Terminal 1. Flight time: 7 hours 12 minutes

错误：

Error : This account is not approved for the authorization service. To enable this service, contact PayPal customer service

Array
(
    [TIMESTAMP] => 2014%2d10%2d20T09%3a36%3a03Z
    [CORRELATIONID] => 4a7ab68babd8b
    [ACK] => Failure
    [VERSION] => 109%2e0
    [BUILD] => 13443904
    [L_ERRORCODE0] => 11623
    [L_SHORTMESSAGE0] => This%20account%20is%20not%20approved%20for%20the%20authorization%20service%2e
    [L_LONGMESSAGE0] => This%20account%20is%20not%20approved%20for%20the%20authorization%20service%2e%20To%20enable%20this%20service%2c%20contact%20PayPal%20customer%20service
    [L_SEVERITYCODE0] => Error
)

---

我在网上浏览过这个错误。但是我找不到那个。请帮助我实现这一点。

这是因为电子邮件地址

PAYMENTREQUEST\u 0\u SellerPayPalaccounted

email@mydomain.com.sg

未确认。

---

尝试确认电子邮件地址，然后再次执行API调用。

在浏览完utter basics后，我找到了答案。PAYMENTREQUEST\u 0\u PAYMENTACTION参数值应在发送前进行url编码

"PAYMENTREQUEST_0_PAYMENTACTION='".urlencode("Sale")