Let's say that John has a PayPal account "john@domain.com". I owe John $10.
Manually, I could log in at my PayPal account, click the 'Send money' button, type "john@domain.com" into the 'Receiver' box, type "$10" into the 'Amount' box, and click the 'Send' button.
This is obviously impractical if I must do this several times every day. The question, really, is:
How can I send $10 to the PayPal account "john@domain.com" from my PayPal account in php code?
