Create a new page in the workspace. By default, creating a page without references to a funnel or show page step will create a standalone landing page.

You can optionally attach the page to a funnel by providing either:

• funnel.funnel_id: Creates a new show page step in the specified funnel. When provided without show_page_step_id, the page is added as the last step of the funnel, positioned after the currently last page.
• funnel.show_page_step_id: Attaches the page to an existing show page step.

To also attach products to the page's checkout step in the same call, pass show_page_step.product_ids: [...] (sibling of funnel). This is the only way to set products at create time — the legacy funnel.products shape is rejected with a 400. Products attachment is additive and all-or-nothing: any unresolved id fails the whole request and the page is not created.