Sign up for a Zapier account if you don't already have one, log into the Zapier, click on Zaps, and then Create Zap!

You’ll be asked to choose a trigger app. Search for Transifex and select it from the drop-down.

Select the event you want to use as a trigger. For this example, we’ll choose Localization Activity Completed. Once you've selected a trigger event, hit Continue.

Connect a New Account, Zapier, to Transifex. Click on the drop-down menu and choose to connect a new account.

A pop-up window will display. Enter your API key and click Yes, Continue.

Once your Key is verified, your Transifex account will be linked to Zapier.

From the drop-down menus, choose the organization, project, and trigger event you will work on and hit Continue.

Once ready, click Test trigger.

Once your trigger is ready, Return to your Zapier home, search for the trigger you just created, and click on it.

Now, Choose an action and search for the Slack APP to trigger the notification.

Once you’ve selected Slack as an App, Select the action and hit Continue.

Now, Let's link your Slack account to your Zapier trigger. Click on "Connect a new account".

Now allow Zapier access to your workspace.

Set up an action according to your needs.

The first setup is to "Send a direct message in Slack".

The second setup is to "Send a channel Message in Slack".

Once you are done, click on TEST, and you should see the notification message on your Slack channel.