Final answer:
Not every app has an OAuth token to access Slack's APIs, but all apps should have a verification token.
Step-by-step explanation:
The statement 'Every app has an OAuth token to access Slack's APIs. They also have a verification token' is False.
OAuth (Open Authorization) is an open standard for authentication that allows apps to access a user's data on another website without the user providing their username and password. While OAuth tokens are commonly used for authentication, not every app has an OAuth token to access Slack's APIs.
On the other hand, verification tokens are used by apps to verify their authenticity when communicating with Slack's APIs. They act as a secret key and are unique to each app.
Therefore, while some apps may use OAuth tokens, not every app has them. However, all apps interacting with Slack's APIs should have a verification token.