order_schema.rb

TaxLineSchema = Dry::Validation.Form do
  optional(:title)
  optional(:price)
  optional(:rate)
  optional(:position)
  optional(:zone)
  optional(:source)
end

OrderSchema = Dry::Validation.Form do
  key(:order).schema do
    key(:email).maybe(:str?)
    optional(:tax_lines).each do
      schema(TaxLineSchema)
    end

    optional(:shipping_lines).schema do
      each do
        key(:title).required(:str?)
      end
    end

    key(:customer).schema do
      optional(:accepts_marketing)
      optional(:addresses)
      optional(:addresses_attributes)
      optional(:email)
      optional(:first_name)
      optional(:last_name)
      optional(:note)
      optional(:origin)
      optional(:password)
      optional(:password_confirmation)
      optional(:send_email_invite)
      optional(:send_email_welcome)
      optional(:tag_string)
      optional(:tags)
      optional(:tax_exempt)
      optional(:multipass_identifie)
      optional(:storage_policie)
    end

    optional(:marketing_attribution).schema do
      key(:medium).required(:str?)
      key(:source).required(:str?)
      key(:campaign).required(:str?)
      key(:share).required(:str?)
      key(:term).required(:str?)
      key(:content).required(:str?)
    end

    optional(:settings).schema do
      key(:send_confirmation_email).required(:bool?)
      key(:send_fulfillment_email).required(:bool?)
      key(:send_cancellation_email).required(:bool?)
      key(:send_refund_email).required(:bool?)

      key(:line_items).schema do
        each do
          optional(:variant)
          optional(:variant_id)
          optional(:order)
          optional(:title)
          optional(:quantity)
          optional(:claimed_inventory)
          optional(:sku)
          optional(:grams)
          optional(:variant_title)
          optional(:vendor)
          optional(:fulfillment_service)
          optional(:price)
          optional(:compare_at_price)
          optional(:fulfillment_status)
          optional(:product)
          optional(:taxable)
          optional(:tax_code)
          optional(:tax_service)
          optional(:requires_shipping)
          optional(:gift_card)
          optional(:cart_discount_allocated_amount)
          optional(:pre_tax_price)
          key(:applied_discounts).schema do
            key(:amount)
            key(::description)
            key(:line_item)
            key(:script_version_id)

          key(:tax_lines).each do
            schema(TaxLineSchema)
          end
        end
      end

      optional(:discount_codes).each(:str?)
      optional(:shipping_address).maybe(:str?)
      optional(:billing_address).maybe(:str?)
      optional(:processed_at).maybe(:date_time?)
      optional(:created_at).maybe(:date_time?)
    end
  end
end