Looks like a cool new technology:
http://mashable.com/2009/07/23/paypal-x/PayPal’s Open Platform Unveiled at First Developer Conference:
https://www.paypal-communications.com/innovate2009/index.htmlYeah I'm beating the open source/platform drum again

But these features will make a big difference anyway:
- Send Money: Peer-to-peer payments can and will happen on multiple platforms, not just on PayPal.com
- Split Payments: You can now split payments among many recipients via the Platform. For example, if you need to pay multiple people a commission on the sale, you can send just one payment instead of four or five.
- Payment Preapproval: Once you log into a system and confirm prepayments, the API will automatically transfer funds based on pre-set specifications.
- Payment Aggregation: To reduce the costs of payment transactions, users can soon aggregate multiple payments into one lump transaction. Amazon Payments already offers this.