Two different migrations - don't confuse them:
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Migrating from Web Form V1 → 2.0 - upgrading from the original (V1) web form to the current 2.0 API. About endpoints and request/response shape.
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Switching from 2.0 to 2.1 - moving a profile from the legacy
aspectstyling to the newthemestyling to adopt the redesigned 2.1 UI. About customization, not integration.