Originally Posted by
DrByte
PayPal Website Payments Standard (IPN) takes the customer to PayPal's site AFTER the ENTIRE checkout in order to make payment. The customer can pay without having a PayPal account (depending on what country YOU are in ... PayPal limits that feature for some countries). After the payment is completed, your store is notified of the completed payment, after which time the order is stored in your database. If the customer pays without making a PayPal account and declines the invitation to make one, your store sits in limbo and never gets the order (due to a bug in PayPal's logic, which they've not fixed yet). If they DO have OR make a PayPal account, you get the notification and the order is stored in your database. **IF there is any problem in PayPal's ability to communicate to your server, you will never see the order, because it relies entirely on PayPal's server being able to talk to your server in order to store the order.
PayPal Express Checkout ... gives the customer two options: They can jump over to the PayPal site to login to their account BEFORE completing checkout on your store (which allows them to select their address information there and never have to re-type their address details on YOUR site, thus the "express" part of the transaction) and then choosing shipping choices and discounts/coupons etc before completing the order ....... OR they can go to the PayPal site to login to their account AFTER making shipping/payment/coupon selections on your site (and creating an account on your store and typing their address info on your store), much like they do with Standard. With Express, they MUST have or make a PayPal account before they can provide payment details. However, Express does not rely entirely on the IPN communications to your store in order to release the order. Instead, it stores the order immediately when payment is completed. It doesn't have to rely on the PayPal server to talk to your server in order to store the order. Granted, you will want PayPal's server to be able to send IPN updates to you for any orders, in case you do refunds or adjustments to the order... so that those updates are reflected in your store's order history.
Website Payments Pro (I know you didn't ask about this one) appears to the customer only as a couple fields to enter their credit card number directly on your website. They have no idea that in the background you're processing their card via PayPal. They have to make an account on your site, and supply the address details, but once they confirm the order, the payment is collected immediately and the order saved. It doesn't rely on IPN to release the order. However, it does store any transaction updates done on the PayPal end such as refunds etc as long as IPNs can be received by your server.
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