This is the harder version of donations, it’s the same challenge, but you can’t donate negative amounts this time.
After playing with it for a while, I realized that the solution was probably to find a way to donate money to your user, bypassing that Jeff Bezos check. So I tested adding more user id’s in the to parameter and the money went to them.
So the solution was to create users, and donate all of their money to a user which will retrieve the flag.
POST /api/donate HTTP/2
Host: donations2-api.challs.umdctf.io
Cookie: session=...
Content-Length: 36
Content-Type: application/x-www-form-urlencoded
to=lisanalgaib&to=gbrls¤cy=999