etsy-polling-lambda

This Lambda function polls Etsy's v3 API for new transactions and saves them to a designated S3 bucket while managing Oauth credentials using DynamoDB.

Requirements

The below Repository secrets are required to allow the github workflows to auto-deploy this Lambda function to your environment upon each code push.

• AWS_ACCESS_KEY_ID
• AWS_REGION
• AWS_SECRET_ACCESS_KEY
• LAMBDA_FUNCTION_NAME

The actions are defined in .github/workflows/uploadToLambda.yml.

Overview

This lambda function is intended to routinely poll the Etsy API for transactions and then do something upon new orders. In the current state, the function will simply save the order to an S3 bucket.

The function can be invoked manually if your cli is configured.

$ aws lambda invoke --function-name EtsyPollingTransactions test.out

However, I currently have the function configured for invocation by an EventBridge rule running every ~2 hours.

The state of the function and the authentication flow (the Oauth credentials & refresh token) is managed with AWS's DynamoDB (key/value database).

NOTE: The more secure way to do this would be using AWS's Secrets Manager, however DynamoDB is a much cheaper (albeit less secure) approach. Each "secret" stored in Secrets Manager costs $0.40/month + $0.05 / 10k API calls. It's really the monthly pricing per secret that gets me. See pricing details here.