Web - Server

Hello, I tried to solve this challenge but there is no luck.
I know if I inject this JSON *REDACTED*
it will give me the flag, but I tried many ways to injected
1- through the ajax call
2- using curl

but I don’t know what I missed.
if there is any hint, I will appreciated

Thank you in advanse

Hi.
Try to intercept post request with some tools and change sending data in it