Step 1: Create a DynamoDB table
Step 2: Create a Lambda function
Step 3: Create an HTTP API
Step 4: Create routes
Step 5: Create an integration
Step 6: Attach your integration to routes
Step 7: Test your API
Step 8: Clean up
Next steps: Automate with AWS SAM or AWS CloudFormation
https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-dynamo-db.html