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我在尝试通过此PayPal订阅表单设置付款时收到错误消息。我正在使用PayPal沙箱测试它。为什么在尝试执行PayPal订阅时收到“无效链接”错误？
，我发现了以下错误：
The link you have used to enter the PayPal system is invalid. Please review the link and try again.
我的代码如下所示：
<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="business" value="[email protected]" id="id_business" />
<input type="hidden" name="item_name" value="Standard" id="id_item_name" />
<input type="hidden" name="a3" value="29.00" id="id_a3" />
<input type="hidden" name="p3" value="1" id="id_p3" />
<input type="hidden" name="t3" value="M" id="id_t3" />
<input type="hidden" name="src" value="1" id="id_src" />
<input type="hidden" name="sra" value="1" id="id_sra" />
<input type="hidden" name="no_note" value="1" id="id_no_note" />
<input type="hidden" name="notify_url" value="http://example.org/dashboard/payments/paypal/notify" id="id_notify_url" />
<input type="hidden" name="cancel_return" value="http://example.org/dashboard/payments/paypal/cancel" id="id_cancel_return" />
<input type="hidden" name="return" value="http://example.org/dashboard/payments/paypal/return" id="id_return_url" />
<input type="hidden" name="cmd" value="_xclick-subscriptions" id="id_cmd" />
<input type="hidden" name="charset" value="utf-8" id="id_charset" />
<input type="hidden" name="currency_code" value="SGD" id="id_currency_code" />
<input type="hidden" name="no_shipping" value="1" id="id_no_shipping" />
<input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="Buy it Now" />
</form>