# Segment ### Connection When you're setting up your first workflow with Segment, you'll need to add your Write Key so that your Segment "Source" is a connected app within MESA.

First, you will need to set up your Source for MESA to send to. The easiest Source type to use would be the [**HTTP Tracking API Source**](https://segment.com/docs/connections/sources/catalog/libraries/server/http-api/). After the Source is set up, you will have to locate the Write Key for posting to that Source. It can be [found on the settings tab](https://segment.com/docs/connections/find-writekey/) or when you first create your Source. 1\. From the Segment dashboard, locate the Source under Sources (left hand side bar). 2\. Click on Settings and then API Keys. Click on the Copy button next to the Write Key. 3\. Paste the Write Key into your MESA workflow's Segment Action and click on Add Connection. Then, you are all set! ### Configure #### How to send data from Segment to MESA In order to send Segment data to MESA, first set up a new MESA Workflow, with the trigger as [Webhook](https://docs.getmesa.com/tools/webhook).

Copy the Host field value from the MESA Trigger and navigate to the Segment dashboard to create a new [Webhooks](https://segment.com/docs/connections/destinations/catalog/webhooks/) Destination**.** Click into Destinations and choose the Webhook Destination you just created, then navigate to the Mappings tab.

Once you are inside the mapping, you should see this field to enter the URL for the Webhook.