account | DynamicAccount | Yes | - | Select the Google Tag Manager account. |
container | DynamicAccount | Yes | - | Select the target container. It absorbs everything from the source container and remains after the merge. |
source_container | DynamicAccount | Yes | - | Select the source container. Its tags, triggers, and variables are moved into the target container, and the source container is retired by the merge. This cannot be undone. |
setting_source | enum (current, other) | No | current | Which container’s settings the merged container keeps: current (the target container’s settings) or other (the source container’s settings). |
allow_user_permission_feature_update | boolean | No | - | Set to true to allow the merge when it would enable per-user permission features on the target container. The API rejects the merge otherwise. |