i intercept the request in burp at a time 2 request going university.edu and api.stipe.com

i change price to zero i gives me error

it accepted 0.5 , price should not be less than 0.50

200k it confirm there is not any error if i change price from 99$ to 0.5$

i tried with strip api it also give me an error if price will $0

i tried with 0.5$

if i change to 0.5$ it gives me 200 ok vulnerability almost confirm if add real credit card it will proceed payment

i created poc and submitted