How to send an implicit approval payment?

Hi.

Could you please include an example for the following (taken from PayPal Adaptive Payment doc)
in the gem document?

"Implicit approval payments, in which your application is both the sender of a payment and
the caller of the Adaptive Payments Pay API.
In this case, PayPal makes the payment from your own account, which eliminates the need
for approval."

Thanks
Zack
