Slack has changed its use of Custom Integrations

[REPTILEHAUS]

Do you have a way to use Slack nowadays,

The custom integrations page says we now have to create custom apps, I dont see any API keys

We recommend replacing your custom integrations with Slack apps, which have more features and use the latest APIs. Learn more about switching to Slack apps.

[smakus]

You just have to create a new slack Bot, and grant it the appropriate oath scope permissions. Once the bot (app) is installed, you can get a Bot User OAuth Access Token for it and it works in the same way.