PayPal Website Payments Pro (US) Direct Payments is an PayPal API-based solution that allows you to take card payments directly on your site. In addition, it has a $30 monthly fee and your account needs to be checked by PayPal. Lastly, you need to be PCI DSS compliant.
PayPal Express Checkout is an API-based solution that will doesn't necessarily require a buyer to enter any details on your site, allowing them a quick checkout through the PayPal site. (Although it's not required. You can still request an address on your cart if you so wish). There is no monthly fee and everyone is free to use it.
PayPal IPN is Instant Payment Notification. In basic terms, PayPal will notify a script on your site via POST whenever a payment has gone through. Great for sending out customized 'Thank you' emails, updating your order database / stock levels, etc. I believe osCommerce only uses it for updating the order status. Oh, and it's free as well.
PayPal Website Payments Standard: forget about it. It's the same as Express Checkout, but worse and more insecure.
PayPal Website Payments Pro (UK) Direct Payments: An older version of Website Payments Pro that was available for some time in the UK. You'll know if you have this, otherwise forget about it.
PayPal Website Payments Pro (UK) Express Checkout: 100% the same as PayPal Express Checkout. Not sure why you have it available a second time.
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PayPal Website Payments Pro（美国）直接付款是一种基于 PayPal API 的解决方案，允许您直接在网站上进行卡付款。此外，它还有 30 美元的月费，并且您的帐户需要通过 PayPal 进行检查。最后，您需要符合 PCI DSS。
PayPal Express Checkout 是一种基于 API 的解决方案，不一定要求买家在您的网站上输入任何详细信息，从而允许他们通过 PayPal 网站快速结帐。 （尽管这不是必需的。如果您愿意，您仍然可以在购物车上请求地址）。
没有月费，每个人都可以免费使用。
PayPal IPN 是即时付款通知。简单来说，只要付款完成，PayPal 就会通过 POST 通知您网站上的脚本。非常适合发送定制的“谢谢”电子邮件、更新订单数据库/库存水平等。我相信 osCommerce 仅使用它来更新订单状态。哦，它也是免费的。
PayPal 网站付款标准：忘记它吧。它与 Express Checkout 相同，但更糟糕且更不安全。
PayPal Website Payments Pro（英国）直接付款：旧版本的 Website Payments Pro，已在英国推出一段时间。如果你有这个你就会知道，否则忘记它。
PayPal Website Payments Pro (UK) Express Checkout：与 PayPal Express Checkout 100% 相同。不知道为什么你第二次可以使用它。
PayPal Website Payments Pro (US) Direct Payments is an PayPal API-based solution that allows you to take card payments directly on your site. In addition, it has a $30 monthly fee and your account needs to be checked by PayPal. Lastly, you need to be PCI DSS compliant.
PayPal Express Checkout is an API-based solution that will doesn't necessarily require a buyer to enter any details on your site, allowing them a quick checkout through the PayPal site. (Although it's not required. You can still request an address on your cart if you so wish).
There is no monthly fee and everyone is free to use it.
PayPal IPN is Instant Payment Notification. In basic terms, PayPal will notify a script on your site via POST whenever a payment has gone through. Great for sending out customized 'Thank you' emails, updating your order database / stock levels, etc. I believe osCommerce only uses it for updating the order status. Oh, and it's free as well.
PayPal Website Payments Standard: forget about it. It's the same as Express Checkout, but worse and more insecure.
PayPal Website Payments Pro (UK) Direct Payments: An older version of Website Payments Pro that was available for some time in the UK. You'll know if you have this, otherwise forget about it.
PayPal Website Payments Pro (UK) Express Checkout: 100% the same as PayPal Express Checkout. Not sure why you have it available a second time.