OAuth2 and client secret

Hi folks,

I'm trying to use the Lightroom API - facing quite a struggle. I'm looking for the Client Secret. It's required for webhooks tools such as in Zapier and Make.com.

In the Adobe Developer console, I set up a project with the Adobe Lightroom services API.  The OAuth web page includes the following: Client ID, Platform (single page app), URI, Redirect URI (for me to input), Redirect URI Pattern (for me to input). Nothing about Client Secret. I have not gotten approved yet.

Am I missing something? Typically, I can get API connections set up pretty easily, but having a hard time on this.

Thanks for the support,