Creating invoice using api

Hello, Dear Zoho Team! I am trying to create invoice using api with fake products. I am using python and following code

import requests

data ={"customer_id":"555350000000041062", "name":"test name", "description":"test description", "rate":100, "quantity":1}

params = {'authtoken':AUTHTOKEN, 'organization_id':43196728, "send":False, "ignore_auto_number_generation":False, "JSONString":data}

headers = {'Content-Type': 'application/json'}

r = requests.post(' https://invoice.zoho.com/api/v3/invoices', params = params, headers = headers)

I have in result: {"code":15,"message":"Internal Error"}. Could you please help me to resolve this question