BETA — Conditional Split Steps are currently in beta. You can request access via the Funnel Coders community but keep in mind that BETA endpoints are subject to change.

Update the condition and/or attach pages to existing branches. At least one of the two must be provided.

• condition.filter_id is the public id of a RefineFilter in the same workspace. Create or update filters via the RefineFilter endpoints. See Attaching a filter and Applying filters to conditional split steps.
• branches must be a 2-entry array (matched, unmatched).
  • page_id (single) — when the branch is empty: attach. When the branch already has show-page-steps: swap the FIRST step's page (subsequent steps preserved).
  • page_ids (array) — APPEND the listed fresh pages to the end of the branch. Use this to grow a branch with more sequential steps over multiple PATCHes. Both forms are mutually exclusive per entry; any page referenced must be a fresh user_page in the same workspace with no existing ShowPageStep.