Beginner Question

Hi all, total noob here so apologies if this is really obvious.

What I’m trying to do is this.

  1. User joins our Slack workspace
  2. Zapier finds the user in Infusionsoft (working fine)
  3. Look at the tags on the user.
  4. If a certain tag exists, invite to a channel.

I’m stuck on step 3.

I can see that Zapier doesn’t work with Tags, so I’ll need to use a Webhook.

I’ve got a developer account & have created an app, but don’t know where to put the API key & secret into Zapier to complete the request.

Any pointers? Like I said, total noob. I know what I want to achieve, just getting stuck on the authentication.