is there a way i can retrieve id's for all my existing journeys in the BU via API or Query.


Yes, you can retrieve all journeys using the following REST API request:

Host: https://YOUR_SUBDOMAIN.rest.marketingcloudapis.com
GET /interaction/v1/interactions/
Content-Type: application/json
Authorization: Bearer YOUR_ACCESS_TOKEN

Just iterate through the JSON response and snag the ID for each of your journeys.

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