> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/integrations/builtin/trigger-nodes/n8n-nodes-base.postmarktrigger.md).

# Start a Duaer digital organization with Postmark Trigger

Postmark Trigger in Duaer is a trigger node: it starts a digital organization instead of running a step after the run has already begun. Node note: Starts the workflow when Postmark events occur
## Postmark Trigger in Duaer

Postmark Trigger is a trigger node in Duaer: when an event arrives or a condition is met, it starts a digital organization.

The product’s node note is: Starts the workflow when Postmark events occur.

## Credentials and parameters

Create the credential type this service needs under Credentials.

Parameters accept expressions. Tool parameters that an AI Agent should fill use $fromAI. When a run fails, read the error on the node output first.
## Questions

### How do you add Postmark Trigger to a Duaer digital organization?

Open the node panel on the Duaer canvas, search for Postmark Trigger, and drop it onto the digital organization. Use it as the start. If auth is required, save the credential first and select it on the node.

### What should you check first when Postmark Trigger fails in Duaer?

Read the error text on that node’s output, then confirm the credential still works and required parameters are filled. For app nodes, also check permissions and quota on the provider side.