Replace Schedule Trigger with Redis Trigger + Rate Limiting for http request (exact online) API

Questions
1

Describe the problem/error/question

I have a working n8n workflow that processes Exact Online orders using a schedule trigger every 30 seconds. I want to replace this with event-driven processing using Redis Trigger while preventing API overload.

Current Working Setup:

  • Webhook receives Exact Online events → Redis enqueue

  • Schedule Trigger (30s) → Redis pop → HTTP API call → Process order

  • Works reliably but polls unnecessarily when queue is empty

Goal: Replace the schedule trigger with Redis Trigger that fires when jobs are queued, but ensure only one HTTP request happens at a time to prevent OAuth token issues.

Constraints:

  • Must prevent concurrent Exact Online API calls (OAuth limitations)

  • Need reliable processing of queued jobs

Please share your workflow

Share the output returned by the last node

Information on your n8n setup

  • n8n version:
  • Database (default: SQLite): Redis Cloud
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via : Docker (Elestio)
  • Operating system: Windows
2

Hey, so do you have any particular question around the new setup?

3

Hi! My goal is to replace the schedule trigger with Redis Trigger that fires when jobs are queued, but ensure only one HTTP request happens at a time to prevent OAuth token issues. When I add a Redis trigger, how do I make sure it pushes one event at a time, instead of multiple in the same seconds?

4

Hey, you can control this via Concurrency control, but it’s global for all workflows.

5

That’'s a good suggestion, but I dont want to change it for all flows. I was thinking of some kind of boleanen: is busy > dont process, is not busy > process

6

Another approach can be:

  • Redis trigger → write events into a queue →
  • Use a Loop node to process events form queue one by one →
  • Send them to sub-workflow and wait for output →
  • Repeat

This can be a good pattern to throttle just that workflow.

7

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