Originally Posted by
DrByte
IPN = Website Payments Standard = collect payment from customers who have or don't have a PayPal account. Transactions are completed only after PayPal's server tells your server that it's done. Sometimes this can be finicky.
Express Checkout = collect payment from customers who have or sign up for a PayPal account. Transactions are completed immediately.
Website Payments Pro = Express Checkout and Gateway. The gateway allows for live processing of credit cards regardless of whether the customer has a paypal account. The customer will not know PayPal was even involved. Transactions are completed immediately. Monthly subscription fee applies.
Testing? Doing a transaction is the easiest way to see that it works. You can refund it when you're done so that you're not "out" by the money.
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