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Workflow APIs

API you can call in Letterdrop workflows

Last updated on August 12, 2025

Create a new Workflow

Select External Lead as the source node

Click on the node and take a look at the Properties on the right

The one required input is a field for the LinkedIn profile of the lead. You can name it whatever you want. Below, it’s called linkedin_url for example.

You can add other input fields as needed. Add the input field name and then how you’d like to refer to it in the Letterdrop workflow variables. We added name and message below for example.

You’ll see the unique API endpoint for this workflow below

Save and activate the workflow

Send an API request to test

Notion image

Trigger a workflow

POST https://api.letterdrop.com/api/v1/workflows/689b3dfc4604090a5588341d

Trigger a workflow.

Headers

Name	Type	Description
api-key	string	API key that is unique to your workspace

Request Body

Note all the field names are customizable as shown above.

Name	Type	Description
lead	string	LinkedIn Profile URL of the lead
custom_field_1	string	Any custom field you define
custom_field_2	string	Any custom field you define
…	…	…
custom_field_n	string	Any custom field you define