What is the function of this API endpoint: "https://okakvoavfg.execute-api.eu-west-1.amazonaws.com/" in Cost Intelligence Dasboard setup?

I'm setting up a Cost Intelligence Dashboard, and as part, I was deploying the cur-aggregation stack in the management account. I noticed that the API_ENDPOINT "https://okakvoavfg.execute-api.eu-west-1.amazonaws.com/" is being used. Does anyone know why this endpoint is used and what its purpose is?

  CIDLambdaAnalytics:
    Type: AWS::Lambda::Function
    Properties:
      Runtime: python3.11 # before updating 
      FunctionName:
        Fn::Sub: ${ResourcePrefix}-CID-Analytics
      Handler: index.lambda_handler
      MemorySize: 128
      Role:
        Fn::GetAtt: CIDLambdaAnalyticsRole.Arn
      Timeout: 15
      Environment:
        Variables:
          **API_ENDPOINT: https://okakvoavfg.execute-api.eu-west-1.amazonaws.com/**
      Code:
        ZipFile: |
          import json
          import boto3
          import os
          import cfnresponse
          import urllib3
          import uuid

          http = urllib3.PoolManager()
          **endpoint=os.environ["API_ENDPOINT"]**
          account_id=boto3.client("sts").get_caller_identity()["Account"]

          def execute_request(action,dashboard_id,via_key):
              try:
                  message=None
                  payload={'dashboard_id': dashboard_id, 'account_id': account_id, via_key: 'CFN'}
                  encoded_data = json.dumps(payload).encode('utf-8')
                  r = http.request(action,endpoint,body=encoded_data,headers={'Content-Type': 'application/json'})
                  if r.status!=200:
                      message=f"This will not fail the deployment. There has been an issue logging action {action}  for dashboard {dashboard_id} and account {account_id}, server did not respond with a 200 response,actual  status: {r.status}, response data {r.data.decode('utf-8')}. This issue will be ignored"
              except urllib3.exceptions.HTTPError as e:
                message=f"Issue logging action {action}  for dashboard {dashboard_id} and account {account_id}, due to a urllib3 exception {str(e)} . This issue will be ignored"
              return message


          def register_deployment(action,dashboards):
              message=f"Successfully logged  {action} for {dashboards}"
              for dashboard_id in dashboards:
                  if action == 'CREATE':
                      message=execute_request('PUT',dashboard_id,'created_via')
                  elif action == 'UPDATE':
                      message=execute_request('PATCH',dashboard_id,'updated_via')
                  elif action == 'DELETE':
                      message=execute_request('DELETE',dashboard_id,'deleted_via')
                  if message is None:
                      message=f"Successfully logged  {action} for {dashboards} "
              #Do not stop deployment if we're not able to successfully record this deployment, still return true
              return ("True",message)


          def lambda_handler(event, context):
              if event['RequestType'] == 'Create':
                  res, reason = register_deployment('CREATE',event['ResourceProperties']['DeploymentType'])
              elif event['RequestType'] == 'Update':
                  res, reason = register_deployment('UPDATE',event['ResourceProperties']['DeploymentType'])
              elif event['RequestType'] == 'Delete':
                  res, reason = register_deployment('DELETE',event['ResourceProperties']['DeploymentType'])
              else:
                  res = False
                  reason = "Unknown operation: " + event['RequestType']

              response_data = {'Reason': reason}
              print(response_data)
              if 'PhysicalResourceId' in event.keys() and event['PhysicalResourceId'] is not None:
                  physicalResourceId=event['PhysicalResourceId']
              else:
                  physicalResourceId=str(uuid.uuid1())
              if res:
                  cfnresponse.send(event, context, cfnresponse.SUCCESS, response_data, physicalResourceId )
              else:
                  cfnresponse.send(event, context, cfnresponse.FAILED, response_data, physicalResourceId )
    Metadata:
      cfn_nag:
        rules_to_suppress:
          - id: 'W89'
            reason: "This Lambda does not require VPC"
          - id: 'W92'
            reason: "One Time execution. No need for ReservedConcurrentExecutions"