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In this video, we are going to create a subscription to Amazon sans topic, so that means you will

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subscribe.

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Amazon says to pick from the ADA lambda.

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So we have two options to perform this subscription.

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So if you open the console, the first option is go to topic and open the topic.

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And if you scroll down, go to subscription list and create the subscription.

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If you click the create subscription, you can see the topic area and you can select the protocol that

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is subscribed to this topic, and you can select a lambda and give the endpoint as a lambda and create

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subscription.

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This is the first way.

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And the second way is go to lambda function and open the our goal function.

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And if you come here and see that, we can edit it as a simple notification service, which is the sense

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to invoke function asynchronously and process the events so we can add trigger to SMS into our lambda

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function.

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Click the a trigger and if you select the trigger configuration as a sense, you can see that it is

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requiring us to SNS topic that we are going to subscribe and trigger from this place.

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You can see in here select the goal notification.

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So please set the goal notification.

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Give the required topic information in here.

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And after that please see this message.

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Basically when we add this trigger, Lambda will add the necessary permissions for a sense to invoke

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our lambda function.

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So if you click the red button, please click this add button and this is going to create a trigger

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or lambda function which is the SAS and trigger is successfully added and that means one.

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Since invoke our function asynchronously, it needs to invoke Lambda Permissions into resource based

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policy with adding trigger sense into lambda function.

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This will require permissions automatically to check this.

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Please go to the please refresh the page, open the goal function again and go to configuration and

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permissions.

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If you scroll down, you can see that this time we have a resource based policy and see the statement

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ID.

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If you click this resource page policy, basically we are giving the permission to the SNS, allowing

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to invoke our lambda function.

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We can see in here, which is the goal notification can be invoked our lambda function very good.

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So these resource based policy added automatically when we are adding trigger to our goal function.

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And also we can confirm the subscription from the sense topics.

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If you go to Amazon SAS, go to topics and open the go notification and scroll down.

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This time you can see the subscription has added successfully and confirmed because the protocol is

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lambda function and the endpoint is our lambda function area that we have successfully subscribed these

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lambda function to the goal notification.

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Amazon sends notification.

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So in the next video we are going to develop our lambda function for the incoming event from the topic.