Example proverkacheka.com

# example bill
fn = '9251440300109733'
fd = '96304'
n = '1'
fp = '3341119416'
t = '02.08.2020+16%3A12'
s = '55.00'

# example
# https://github.com/enrike666/telegram-bot/blob/02c61ccd8622b9b954942b464b74020f6d254029/main_test.go
# t=20200601T2122&s=213.07&fn=9282440300649733&i=12416&fp=2858316733&n=1
fn = '9282440300649733'
fd = '12416'
n = '1'
fp = '2858316733'
t = '01.06.2020+21%3A22'
s = '213.07'

headers = {
    "Accept": "application/json, text/javascript, */*; q=0.01",
    "Referer": "https://proverkacheka.com/",
    "X-Requested-With": "XMLHttpRequest",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) "
                    "Chrome/81.0.4044.122 Safari/537.36 "
}

data = {
    "fn": fn,
    "fd": fd,
    "fp": fp,
    "n": "1",
    "s": s,
    "t": t,
    "qr": "0"
}

responce = requests.post("https://proverkacheka.com/check/get",
                            headers=headers,
                            data=data)
print(responce.status_code)
print(responce.text)