> They did conveniently offer financing so that we could get paid sooner, albeit with interest.

That's blown my mind a little, charging interest on a loan of money which you owe to someone. Genius.

Sounds more like a low effort scam to me...

What do you mean switched? It's usually spelled out in the contract, no? And they can't just change it unilaterally, right?

So if they want to renegotiate, fine, the rate goes up by the interest (and or risk premium).

I think they also know that the cost of onboarding new providers for large corporations is high, so vendors tend to price enterprise higher than SB, since they know there is more reporting and more hoops to jump through.

Personally as a self employed consultant, I'd take the financing. Not so much for cash flow (though it is a consideration), but just my overall paranoia toward not getting paid and always valuing a bird in hand. But I've been burnt before.

this seems like bank factoring - getting a part of your future account receivable now. some banks do that, not sure if the rates are any good.

This actually has got a name in treasury circles: it's called "reverse factoring". One of the very nice side effects is that when you're a big publicly traded company, you can generally afford to set up a dedicated entity to handle this business, which gets to be considered a financial entity by IFRS reporting standards, which (through a complex reasoning I won't bother you with) magically enhance your operating cash flow - one of the more important reporting metrics when you're not actually not a bank but e.g a retailer.