I've learned that getting a Make.com scenario to run once doesn't necessarily mean it's ready for real use.
A webhook can receive a test request, the next module can run successfully, and the data can appear in the right place. Everything looks fine.
Then a real event arrives with a missing field, an unexpected value, or a slightly different payload, and the workflow behaves differently than expected.
Before relying on a webhook automation, I like to test a few things beyond the happy path.
1. Start With a Known Test Payload
First, send a simple test request through the webhook.
Use realistic sample data rather than empty or random values. For example, if you're testing an order notification workflow, include fields such as:
- Order ID
- Product name
- Customer email
- Order status
- Purchase timestamp
The exact fields depend on your workflow.
In Make, open the scenario, run it in a controlled test, and inspect the output bundle from the webhook module.
Check that the values arrived as expected and that the following modules can access the fields they need.
One small detail worth checking: a field that exists in one test payload may be missing from another. Don't assume every incoming request will have exactly the same structure.
2. Check What Happens When a Field Is Missing
Next, test an incomplete payload.
For example, send a request without an optional customer name or product description.
Ask yourself:
- Does the scenario stop unexpectedly?
- Does a message get sent with blank or confusing information?
- Does the next module reject the request?
- Can the workflow still complete safely?
Not every field needs to be mandatory. The important thing is to decide which fields are required and what should happen when they're absent.
For customer-facing messages, I'd rather show a sensible fallback than send a notification full of empty values.
3. Test Duplicate Events
Webhooks can sometimes deliver the same event more than once, depending on the sending system and how retries work.
For an order workflow, that could mean duplicate notifications or repeated records.
Try sending the same test event twice.
If the scenario creates duplicate results, consider whether you need a unique event ID, an order ID check, or another idempotency mechanism.
The right solution depends on the source system and how the workflow is designed. Simply adding a delay won't reliably prevent duplicates.
4. Test the Failure Path
A useful test isn't only one where everything works.
Check what happens when a downstream module fails, a connection needs attention, or a request doesn't contain the expected data.
In Make, inspect the scenario's execution history and review the relevant module output and error details.
Depending on the workflow, you may need error handling, a notification to yourself, or a way to retry failed operations safely.
Avoid assuming that every failure should trigger an automatic retry. If an operation has already succeeded but its response was lost, retrying it without checking the outcome may create duplicate actions.
5. Verify the Final Result
Don't stop when the scenario shows a successful execution.
Check the destination too.
If the workflow sends a Telegram notification, confirm that the message arrived and that the content is correct.
If it writes to Notion, open the database and verify that the record contains the expected values.
If it triggers another service, check that service rather than relying only on the previous module's status.
The goal is to confirm the complete result, not just that the scenario started.
6. Use a Small Go-Live Checklist
Before switching a workflow into regular use, I would check these items:
- [ ] A normal test payload works.
- [ ] Required and optional fields behave as expected.
- [ ] Missing fields don't create misleading output.
- [ ] Duplicate events have been considered.
- [ ] Failures are visible and can be investigated.
- [ ] The final destination contains the correct result.
- [ ] The workflow has been tested with realistic data.
You don't need a complicated testing framework for every small automation. Even a short checklist can catch issues that are easy to miss when you're focused on getting the scenario running.
One Last Thing
I've been trying to keep my own automation workflows small enough to understand and maintain.
It's tempting to add more modules whenever a new requirement appears. But before expanding a scenario, I want to know that the existing workflow handles normal requests, unexpected input, and failures in a predictable way.
A workflow that runs once is a good start. A workflow you can troubleshoot when something goes wrong is much more useful.
What's the most common issue you've run into when testing webhook automations?
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