Why should you care?

AwsVerse payment platform runs across AZs with retries, circuit breakers, and idempotent APIs.

See it live — copy this example

Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).

const { SQSClient, SendMessageCommand } = require('@aws-sdk/client-sqs');
const sqs = new SQSClient({ maxAttempts: 5 });
await sqs.send(new SendMessageCommand({
  QueueUrl: process.env.WORK_QUEUE_URL,
  MessageBody: JSON.stringify({ idempotencyKey: 'PAY-441', payload: data })
}));

What happened?

• SDK client retries SQS send up to five times with exponential backoff.
• Idempotency key lets downstream dedupe safely.

Practice next

1. Identify sync calls that should be async queues.
2. Add idempotency keys to write APIs.
3. Test AZ failure with chaos exercise.
4. Add circuit breaker library around external HTTP calls.
5. Measure p99 across three AZ deployment.

Remember

Design for partial failure. Use queues for async boundaries. Idempotency keys prevent duplicates.

AwsVerse resilient pay

Partner API timeout should not lose payment.

Outcome: SQS retry plus idempotent ledger write guarantees exactly-once effect.