PayPal IPN HTML表单的src和sra表单字段有什么作用? [英] What do the src and sra form fields for PayPal IPN HTML form do?

问题描述

示例: paypal定期付款表

启用一个功能后，它会在结帐表格上从一个月"更改为每个月"，为什么我需要两个?

When I have one enabled, it changes "for one month" to "for each month" on the checkout form, so why do I need two of them?

我在这里寻找变量，但找不到它. https://developer.paypal.com /webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id091EB0901HT

I've looked for the variables here and cannot find it. https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id091EB0901HT

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