The concept

Cash flow is the distance between the sale and the money being available. An operation can bill well and still get stuck, if traffic is paid for today and the sale's payout arrives two weeks later.

What determines that distance is the withdrawal period combined with the rolling reserve. The practical math is simple: multiply your daily revenue by the days of waiting, and that's the capital sitting idle on the platform at all times.

That's why the difference between getting paid in D+3 and in D+15 isn't a contractual detail. It's how much working capital the operation needs to run at the same volume.

How it shows up in practice

You sell an infoproduct and earn 10 thousand per day in revenue, but the platform releases the money in D+15. While you wait, you spend 8 thousand on traffic that needs to be paid immediately. So your working capital stays stuck waiting for the release.

Ultimately, the business that can spend the most to acquire a customer wins.

Dan Kennedy Source: quoted by Russell Brunson in DotCom Secrets.

Cash flow is this distance between the sale and the money being available. At D+3 you only need 30 thousand sitting idle. At D+15 it's 150 thousand. It's not a contract detail, it's how much capital you need to have in reserve to run the same volume of operations without getting stuck.