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authentik/docs/flow/flows.md

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# Flows
Flows are a method of describing a sequence of stages. A stage represents a single verification or logic step. They are used to authenticate users, enroll them, and more.
Upon Flow execution, a plan is generated, which contains all stages. This means upon execution, all attached policies are evaluated. This behaviour can be altered by enabling the **Re-evaluate Policies** option on the binding.
To determine which flow is linked, passbook searches all Flows with the required designation and chooses the first instance the current user has access to.
## Permissions
Flows can have policies assigned to them, which determines if the current user is allowed to see and use this flow.
## Designation
Flows are designated for a single Purpose. This designation changes when a Flow is used. The following designations are available:
### Authentication
This is designates a flow to be used for authentication.
The authentication flow should always contain a [**User Login**](stages/user_login.md) stage, which attaches the staged user to the current session.
### Invalidation
This designates a flow to be used for the invalidation of a session.
This stage should always contain a [**User Logout**](stages/user_logout.md) stage, which resets the current session.
### Enrollment
This designates a flow for enrollment. This flow can contain any amount of Prompt stages, E-Mail verification or Captchas. At the end to create the user, you can use the [**User Write**](stages/user_write.md) stage, which either updates the currently staged user, or if none exists, creates a new one.
### Unenrollment
This designates a flow for unenrollment. This flow can contain any amount of verification, like [**E-Mail**](stages/email/index.md) or [**Captcha**](stages/captcha/index.md). To finally delete the account, use the [**User Delete**](stages/user_delete.md) stage.
### Recovery
This designates a flow for recovery. This flow normally contains an [**Identification**](stages/identification/index.md) stage to find the user. Then it can contain any amount of verification, like [**E-Mail**](stages/email/index.md) or [**Captcha**](stages/captcha/index.md).
Afterwards, use the [**Prompt**](stages/prompt/index.md) stage to ask the user for a new password and use [**User Write**](stages/user_write.md) to update the password.
### Change Password
This designates a flow for password changing. This flow can contain any amount of verification, like [**E-Mail**](stages/email/index.md) or [**Captcha**](stages/captcha/index.md).
Afterwards, use the [**Prompt**](stages/prompt/index.md) stage to ask the user for a new password and use [**User Write**](stages/user_write.md) to update the password.