question

The following piece of code that I was using was running perfectly until a few hours ago. But now throws error.

##PAYMENTS
    
    # create a cipher from the RSA key and use it to encrypt the card number, prepended with the prefix 
    #from GET /v2/merchant/{muid}/pay/key
    cipher = PKCS1_OAEP.new(RSAkey)
    # encode str to byte (https://eli.thegreenplace.net/2012/01/30/the-bytesstr-dichotomy-in-python-3)
    encrypted = cipher.encrypt((prefix + cardNumber).encode())

    # Base64 encode the resulting encrypted data into a string to use as the cardEncrypted' property.
    cardEncrypted = b64encode(encrypted)

    post_data = {
        "orderId": orderId,
        "currency": "usd",
        "amount": int(total),
        "expMonth": expMonth,
        "cvv": CVV,
        "expYear": expYear,
        "cardEncrypted": cardEncrypted,
        "last4": cardNumber[-4:],
        "first6": cardNumber[0:6]
    }

    posturl = environment + "v2/merchant/" + muid + "/pay"
    sleep(0.1)
    response = requests.post(posturl,headers = headers,data= post_data)
    
    if response.status_code != 200:
        print(response.text.encode('utf8'))
        print(str(response.status_code)+"Something went wrong during developer pay")
        sys.exit()

400: Cannot Parse JSON error.

Please help