Precondition: An agreement between Alice and Charlie is reached out-of-band.
For this example, we assume Charlie is going to buy 10 units (1m satoshi)
of capacity from Pool for Alice. Of those 10 units, **2 units will be
pushed** to Alice for her to gain outbound liquidity as well.
The cost for the order submission fees, chain fees, the premium and the push
amount are all paid from Charlie's Pool account. Whether Alice reimburses
Charlie for those costs or not is not part of the protocol and irrelevant for