AWS CloudFormation ignore an existing resource

Question

I created a stack in CloudFormation and I need help to improve it. In the stack below I have a VPC Endpoint but it is not possible to create it twice, that is, I cannot have two equal services name. Does anyone have any idea to create a condition that if the VPC Endpoint is created it skips this step?

  VPCEndpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      ServiceName: !Join
        - ''
        - - com.amazonaws.
          - !Ref 'AWS::Region'
          - .execute-api
      PrivateDnsEnabled: true
      SecurityGroupIds: 
        - !Ref 9SecurityGroupId
      SubnetIds: 
        Ref: 8SubnetIds
      VpcEndpointType: Interface
      VpcId: 
        Ref: 7VpcId
  
  APIGateway:
    Type: AWS::ApiGateway::RestApi
    Properties:
      Name: !Ref 1Name
      EndpointConfiguration:
        Types:
          - PRIVATE
        VpcEndpointIds:
          - !Ref VPCEndpoint
      Policy:
        Statement:
          - Action: 'execute-api:Invoke'
            Effect: Allow
            Principal: '*'
            Resource: 'execute-api:/*'
          - Action: 'execute-api:Invoke'
            Condition:
              StringNotEquals:
                'aws:SourceVpce': !Ref VPCEndpoint
            Effect: Deny
            Principal: '*'
            Resource: 'execute-api:/*'
        Version: 2012-10-17

Answer 1

Does anyone have any idea to create a condition that if the VPC Endpoint is created it skips this step?

Yes, you have to either create macro or custom resource if you want the detection of pre-existing resources to be fully automated.

Otherwise, you can just create an input parameter to your template, e.g. ShouldCreateTheInterfaceEndpoint. Then you just set it to false or true when you deploy your template.