Unable to complete a put request

Serverless Framework
1

Hi, I was trying to make an API gateway with lambdas and DynamoDb in python. The put function works fine if I hit it with test in AWS console, but if API Gateway tries to access it by URL, I get an error:
{ message: "Missing Authentication Token" },
My serverless.yml file is :


service: simple-backend

custom:
  settings:
    POSTS_TABLE: posts
  pythonRequirements:
    dockerizePip: true


provider:
  name: aws
  runtime: python3.7
  profile: serverless-admin
  region: ap-southeast-2
  iamRoleStatements:
  #Mention permissions explicitly.It's good practice not to give more permissions.
    - Effect: "Allow"
      Action:
        - dynamodb:DescribeTable
        - dynamodb:Scan
        - dynamodb:GetItem
        - dynamodb:PutItem
        - dynamodb:UpdateItem
        - dynamodb:DeleteItem
      Resource:
      #Mentioning name of region and the table
        - "arn:aws:dynamodb:${self:provider.region}:*:table/${self:custom.settings.POSTS_TABLE}"

functions:

  putuserinfo:
    handler: handler.putuserinfo
    events:
      - http:
          path: putuserinfo
          method: put
          cors: true
  getuserinfo:
    handler: handler.getuserinfo
    events:
      - http:
      #Creates a path in API gateway
          path: getuserinfo
          method: get
          cors: true
  
Install the following plugin using npm if you want to use boto3

resources:
#under resource, cloudformation template can be defined. 
  Resources:
    PostsTable:
      Type: AWS::DynamoDB::Table
      Properties:
        AttributeDefinitions:
        - AttributeName: "username"
          AttributeType: "S"
        - AttributeName: "gameid"
          AttributeType: "S"
        

        #Following is same as CloudFromation syntax
        #KeySchema should have length less than or equal to 2.
        KeySchema:
          - AttributeName: "username"
            KeyType: "HASH"
          - AttributeName: "gameid"
            KeyType: "RANGE"
          
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1
        TableName: ${self:custom.settings.POSTS_TABLE}
plugins:
  - serverless-python-requirements

My handler.py file is:

import boto3
def getuserinfo(event, context):
    print ("context is", context)
   
    message = "Data was saved"
    return {
        'statusCode' : 200,
        'headers': {'Content-Type': 'application/json'},
        'body': json.dumps({'message' : message })
    }

dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('posts')
def putuserinfo(event, context):
    table.put_item(
        Item = {
            'username': '12345',
            'gameid':'123'
        })
    message = "Data was saved"
    return {
        'statusCode' : 200,
        'headers': {'Content-Type': 'application/json'},
        'body': json.dumps({'message' : message })
    }

My get function works perfectly, if I hit the url after the deploy, but the url specified in deploy for put function produces the above error, which says “missing authentication Token”