RecurringInvoiceRequest:
      required:
        - client_id
        - date
        - due_date
        - frequency_id
      properties:
        client_id:
          description: 'The hashed ID of the client'
          type: string
          example: 'D2J234DFA'
        date:
          description: 'Recurring invoice date'
          type: string
          format: date
          example: '2024-01-01'
        due_date:
          description: 'Due date for the recurring invoice'
          type: string
          format: date
          example: '2024-01-31'
        frequency_id:
          description: 'Frequency ID for recurring invoice'
          type: string
          example: '1'
        remaining_cycles:
          description: 'Number of remaining cycles'
          type: string
          example: '5'
        private_notes:
          description: 'Private notes for the recurring invoice'
          type: string
          example: 'Internal notes about this recurring invoice'
        public_notes:
          description: 'Public notes for the recurring invoice'
          type: string
          example: 'Thank you for your business!'
        custom_value1:
          description: 'Custom field value 1'
          type: string
          example: 'Custom value 1'
        custom_value2:
          description: 'Custom field value 2'
          type: string
          example: 'Custom value 2'
        custom_value3:
          description: 'Custom field value 3'
          type: string
          example: 'Custom value 3'
        custom_value4:
          description: 'Custom field value 4'
          type: string
          example: 'Custom value 4'
        line_items:
          type: array
          description: 'An array of objects which define the line items of the invoice'
          items:
            $ref: '#/components/schemas/InvoiceItem'