type: object properties: content: type: string description: The text content of the scheduled message example: "Hello! This is a scheduled message." scheduled_at: type: string format: date-time description: ISO 8601 datetime when the message should be sent example: "2026-02-01T10:00:00Z" status: type: string enum: ["draft", "pending"] description: The status of the scheduled message. Use 'draft' to save without scheduling, 'pending' to schedule the message. example: "pending" attachment: type: string format: binary description: File attachment for the scheduled message template_params: type: object description: Template parameters for WhatsApp template messages example: name: "order_confirmation" category: "MARKETING" language: "en" processed_params: body: "1": "121212"