VTex Fulfillment simulation - External Seller

This endpoint may be called upon by VTEX for fulfillment simulation in the external seller different contexts. See examples below. When a [price](https://developers.vtex.com/docs/api-reference/marketplace-apis#post-/notificator/-sellerId-/changenotification/-skuId-/price) or [inventory](https://developers.vtex.com/docs/api-reference/marketplace-apis#post-/notificator/-sellerId-/changenotification/-skuId-/inventory) notification request returns a response with status `200 OK`, it means that t...