# Opt-In Processes

Endpoints related to opt-in workflows and subscription confirmation processes.
These operations support compliant subscriber onboarding, including single and double opt-in flows.

 - [GET /list](https://developers.klicktipp.com/management-api/opt-in-processes/api.optin.index.md): Lists the IDs and names of all opt-in processes. **Notice:** The Id without a name is the Default Double Opt-In present in each KlickTipp Account.
 - [GET /list/{listid}](https://developers.klicktipp.com/management-api/opt-in-processes/api.optin.retrieve.md): Returns the complete data of an opt-in process.
 - [POST /list/redirect](https://developers.klicktipp.com/management-api/opt-in-processes/api.optin.redirect.md): Search the redirection URL for a specific opt-in process.