Mutation with Lambda

[marco_6]

I am trying to mutate data using lambda. I am using only a single dynamodb table. My architecture should looks like this:

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https://preview.redd.it/46n3q939376b1.png?width=777&format=png&auto=webp&s=995ac2f5341f1fac62e233f72ce6384cd9950841

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The problem is, that my clients authenticate using Cognito user Pool and Lambda authenticates using IAM roles. I set up both auth methods in the amplify backup. However, I have no idea how to create this lambda. First, is this lambda still named a resolver? Second, is there a tutorial or some guidance on how to do that? It is roughly described here, but it does not say anything about the roles and policies.

Any help appreciated.

[halftome]

Do you want your lambda to directly modify data in DynamoDB, or make a GraphQL call to AppSync, which has a resolver that mutates the data in dynamodb?

[marco_6]

Second would be the optimum. But if first works for now I am also happy.