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defmodule DaProductApp.QRValidation.QRValidation do |
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@moduledoc """ |
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QR Validation aggregate for UPI International transactions. |
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Stores normalized data from ReqValQr/RespValQr with FX information. |
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Handles both domestic and international QR validation flows. |
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""" |
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use Ecto.Schema |
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import Ecto.Changeset |
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alias DaProductApp.QRValidation.{QRValidationEvent, FXQuote} |
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alias DaProductApp.Partners.{Partner, Merchant} |
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# Temporarily use integer ID to match database schema |
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# @primary_key {:id, :binary_id, autogenerate: true} |
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# @foreign_key_type :binary_id |
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schema "qr_validations" do |
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# Core UPI fields |
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field :txn_id, :string |
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field :msg_id, :string |
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field :org_id, :string |
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field :payer_addr, :string |
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field :payer_name, :string |
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field :payee_addr, :string # Enhanced: Merchant VPA |
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field :payee_name, :string # Enhanced: Merchant name |
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field :network_inst_id, :string |
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field :con_code, :string |
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field :qr_version, :string |
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field :qr_medium, :string |
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field :ver_token, :string |
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field :qr_expires_at, :utc_datetime |
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# International FX fields (enhanced) |
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field :base_amount, :decimal # Amount in merchant's local currency |
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field :base_currency, :string # Merchant's currency (USD, SGD, AED) |
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field :foreign_amount, :decimal # Legacy field, same as base_amount |
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field :foreign_currency, :string # Legacy field, same as base_currency |
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field :fx_rate, :decimal # Applied exchange rate |
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field :markup_pct, :decimal # PSP markup percentage |
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field :inr_amount_calc, :decimal # Calculated INR amount for customer |
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field :fx_timestamp, :utc_datetime # When FX rate was locked |
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field :corridor, :string # "SINGAPORE", "UAE", "USA" |
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field :fx_provider, :string # "RBI", "PARTNER_API", "MANUAL" |
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# NPCI Communication timestamps |
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field :npci_request_received_at, :utc_datetime # When NPCI request was received by PSP |
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field :npci_response_sent_at, :utc_datetime # When PSP response was sent back to NPCI |
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# QR and validation metadata |
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field :qr_hash, :binary |
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field :raw_xml, :binary |
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field :resp_xml, :binary # SHA-256 hash of RespValQr XML sent to NPCI |
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field :status, :string, default: "validated" |
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field :validation_type, :string, default: "INTERNATIONAL" # "DOMESTIC", "INTERNATIONAL" |
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field :merchant_category, :string # Business category |
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field :transaction_purpose, :string # Purpose code for international |
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field :initiation_mode, :string # "01" for static, "16" for dynamic QR |
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# Relationships |
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belongs_to :partner, Partner |
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belongs_to :merchant, Merchant |
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has_many :events, QRValidationEvent |
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has_many :fx_quotes, FXQuote |
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timestamps(type: :utc_datetime) |
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end |
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@required ~w(msg_id org_id status validation_type)a |
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@optional ~w( |
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txn_id payer_addr payer_name payee_addr payee_name network_inst_id |
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con_code qr_version qr_medium ver_token qr_expires_at |
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base_amount base_currency foreign_amount foreign_currency |
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fx_rate markup_pct inr_amount_calc fx_timestamp corridor fx_provider |
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npci_request_received_at npci_response_sent_at |
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qr_hash raw_xml resp_xml merchant_category transaction_purpose initiation_mode |
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partner_id merchant_id |
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)a |
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def changeset(struct, attrs) do |
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struct |
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|> cast(attrs, @required ++ @optional) |
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|> validate_required(@required) |
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|> validate_inclusion(:validation_type, ["DOMESTIC", "INTERNATIONAL"]) |
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|> validate_inclusion(:corridor, ["SINGAPORE", "UAE", "USA", "UK", "JAPAN", "AUSTRALIA"]) |
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|> validate_inclusion(:base_currency, ["USD", "SGD", "AED", "GBP", "JPY", "AUD", "INR"]) |
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|> validate_number(:fx_rate, greater_than: 0) |
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|> validate_number(:markup_pct, greater_than_or_equal_to: 0) |
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|> validate_base_amount_for_qr_type() |
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|> validate_international_fields() |
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|> unique_constraint([:msg_id, :org_id]) |
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|> unique_constraint(:ver_token) |
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end |
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@doc """ |
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Changeset for international QR validation with FX details |
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""" |
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def international_changeset(struct, attrs) do |
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attrs_with_type = Map.put(attrs, :validation_type, "INTERNATIONAL") |
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struct |
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|> changeset(attrs_with_type) |
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|> validate_required([:base_amount, :base_currency, :corridor, :fx_rate]) |
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|> validate_fx_calculation() |
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end |
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@doc """ |
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Changeset for domestic QR validation |
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""" |
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def domestic_changeset(struct, attrs) do |
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:-( |
attrs_with_type = Map.put(attrs, :validation_type, "DOMESTIC") |
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struct |
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|> changeset(attrs_with_type) |
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|> put_change(:base_currency, "INR") |
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|> put_change(:corridor, nil) |
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end |
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# Private validation functions |
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defp validate_international_fields(changeset) do |
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case get_field(changeset, :validation_type) do |
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"INTERNATIONAL" -> |
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changeset |
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|> validate_required([:base_amount, :base_currency, :corridor]) |
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|> validate_fx_fields_consistency() |
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"DOMESTIC" -> |
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changeset |
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|> put_change(:base_currency, "INR") |
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|> put_change(:corridor, nil) |
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end |
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end |
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defp validate_fx_fields_consistency(changeset) do |
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# Ensure foreign_amount matches base_amount (legacy compatibility) |
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base_amount = get_field(changeset, :base_amount) |
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base_currency = get_field(changeset, :base_currency) |
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changeset |
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|> put_change(:foreign_amount, base_amount) |
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|> put_change(:foreign_currency, base_currency) |
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end |
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defp validate_fx_calculation(changeset) do |
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base_amount = get_field(changeset, :base_amount) |
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fx_rate = get_field(changeset, :fx_rate) |
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markup_pct = get_field(changeset, :markup_pct) || Decimal.new("0") |
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inr_calc = get_field(changeset, :inr_amount_calc) |
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if base_amount && fx_rate && inr_calc do |
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# Validate INR calculation: INR = Base Amount ÷ FX Rate × (1 + Markup) |
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expected_inr = calculate_inr_amount(base_amount, fx_rate, markup_pct) |
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inr_diff = Decimal.sub(inr_calc, expected_inr) |> Decimal.abs() |
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if Decimal.gt?(inr_diff, Decimal.new("0.01")) do # Allow 1 paisa tolerance |
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add_error(changeset, :inr_amount_calc, "does not match FX calculation") |
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else |
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:-( |
changeset |
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end |
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else |
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:-( |
changeset |
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end |
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end |
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defp validate_base_amount_for_qr_type(changeset) do |
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initiation_mode = get_field(changeset, :initiation_mode) |
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base_amount = get_field(changeset, :base_amount) |
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case {initiation_mode, base_amount} do |
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# Static QR (mode "01") can have 0.00 amount (customer enters amount) |
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{"01", amount} when is_nil(amount) -> |
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changeset |
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{"01", amount} when not is_nil(amount) -> |
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# For static QR, check if amount is zero (allow 0.00 for static QRs) |
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if Decimal.equal?(amount, Decimal.new("0")) or Decimal.equal?(amount, Decimal.new("0.00")) do |
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changeset |
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else |
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validate_number(changeset, :base_amount, greater_than_or_equal_to: 0) |
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end |
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# Dynamic QR (mode "16") must have amount > 0 |
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{"16", amount} when not is_nil(amount) -> |
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validate_number(changeset, :base_amount, greater_than: 0) |
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# If no initiation_mode specified, default to requiring amount > 0 (backward compatibility) |
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{nil, amount} when not is_nil(amount) -> |
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validate_number(changeset, :base_amount, greater_than: 0) |
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# Allow nil amount for now (will be caught by other validations if required) |
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{_, nil} -> |
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changeset |
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# Any other case, validate normally |
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_ -> |
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validate_number(changeset, :base_amount, greater_than: 0) |
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end |
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end |
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defp calculate_inr_amount(base_amount, fx_rate, markup_pct) do |
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# INR = Base Amount ÷ FX Rate × (1 + Markup%) |
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inr_before_markup = Decimal.div(base_amount, fx_rate) |
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markup_multiplier = Decimal.add(1, Decimal.div(markup_pct, 100)) |
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Decimal.mult(inr_before_markup, markup_multiplier) |
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end |
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end |