cost explorer in python-boto3 unknown service 'ce'

Good day, Recent AWS release API for know the billing information.

It is available in all aws SDK (c#,python,php). I just tried a lambda function to update my database table with current cost of my all linked accounts. but mt lambda function doesn't work. it show the following error

"Unknown service: 'ce'. Valid service names are: acm, apigateway, application-autoscaling, appstream, athena, autoscaling,etc "

my lambda code is :

import boto3
from datetime import datetime, timedelta
def lambda_handler(event, context):
client1 = boto3.client(
'ce',
aws_access_key_id=accesskey,
aws_secret_access_key=secretkey)
[referral link for client creation][1]
response = client1.get_cost_and_usage(
TimePeriod={
    'Start': startdate,
    'End': enddate
},
Granularity='MONTHLY',
Metrics=[
    'BlendedCost',
],
GroupBy=[
    {
        'Type': 'DIMENSION',
        'Key': 'LINKED_ACCOUNT'
    },
],
)

print response