It was effectively a "monetary miracle". The author was Hjalmar Schacht, Hitler's central banker. He issued monetary instruments for each unit of labour performed (non-inflationary). The key takeaway is that “fiat money creation” is not inherently bad and inflationary, but it depends on whether it is used for productive investment (non inflationary) or for consumption (inflationary). I have explained it all in this article here

https://primal.net/bitcoindollar/the-central-banker-who-resuscitated-germanys-dead-economy-after-wwi

And by the way - for those who care diving into the real hidden reasons of WWII - as usual, follow the money....