internal/constants/loyalty.go

@@ -42,6 +42,9 @@ const (
 	LoyaltyExpiryUnitSuffix         = "expiry_unit"
 	LoyaltyExpiryEndOfMonthSuffix   = "expiry_end_of_month"
 	LoyaltyExpiryReminderDaysSuffix = "expiry_reminder_days"
+	LoyaltyExpiryModeSuffix         = "expiry_mode"
+	LoyaltyExpiryFixedDatesSuffix   = "expiry_fixed_dates"
+	LoyaltyExpiryGraceMonthsSuffix  = "expiry_grace_months"
 )
 
 // Units of loyalty.{point,coin}.expiry_unit.
@@ -50,6 +53,14 @@ const (
 	LoyaltyExpiryUnitMonth = "MONTH"
 )
 
+// Modes of loyalty.{point,coin}.expiry_mode (note N4, decided: both are supported).
+const (
+	// Every balance expires on the same fixed dates of the year, such as 31 Dec.
+	LoyaltyExpiryModeFixedDate = "FIXED_DATE"
+	// Every balance lasts a period from when it was received.
+	LoyaltyExpiryModeRolling = "ROLLING"
+)
+
 // Defaults from the PRD.
 const (
 	LoyaltyPointEarnPerAmountDefault = int64(100)
@@ -68,4 +79,8 @@ const (
 	LoyaltyExpiryPeriodDefault       = int64(12)
 	LoyaltyExpiryUnitDefault         = LoyaltyExpiryUnitMonth
 	LoyaltyExpiryReminderDaysDefault = int64(7)
+	LoyaltyExpiryModeDefault         = LoyaltyExpiryModeFixedDate
+	// Once a year on 31 December, as MM-DD.
+	LoyaltyExpiryFixedDatesDefault  = "12-31"
+	LoyaltyExpiryGraceMonthsDefault = int64(3)
 )

internal/models/loyalty.go

@@ -57,15 +57,29 @@ type LoyaltyTransferSettings struct {
 	DailyLimit        *int64 `json:"daily_limit"`
 }
 
-// LoyaltyExpirySettings is how long one currency lasts once received. The expiry
-// model is still open (note N4); these are only the stored settings.
+// LoyaltyExpirySettings is when one currency expires once received (F12). Both
+// models of note N4 are supported, and the owner picks one:
+//
+//   - FIXED_DATE: everything expires on the next of FixedDates falling on or after
+//     the day received + GraceMonths, so a balance received just before a date moves
+//     on to the one after.
+//   - ROLLING: everything lasts Period Units from the day received, to the end of
+//     that month when EndOfMonth is set.
 type LoyaltyExpirySettings struct {
-	Enabled bool  `json:"enabled"`
-	Period  int64 `json:"period"`
-	// DAY or MONTH.
-	Unit         string `json:"unit"`
-	EndOfMonth   bool   `json:"end_of_month"`
-	ReminderDays int64  `json:"reminder_days"`
+	Enabled bool `json:"enabled"`
+	// FIXED_DATE or ROLLING.
+	Mode string `json:"mode"`
+	// FIXED_DATE: the days of the year balances expire on, as MM-DD, sorted.
+	FixedDates []string `json:"fixed_dates"`
+	// FIXED_DATE: how many months a balance lasts at least before a fixed date takes it.
+	GraceMonths int64 `json:"grace_months"`
+	// ROLLING: how long a balance lasts.
+	Period int64 `json:"period"`
+	// ROLLING: DAY or MONTH.
+	Unit       string `json:"unit"`
+	EndOfMonth bool   `json:"end_of_month"`
+	// Days before expiry the customer is reminded; 0 for no reminder.
+	ReminderDays int64 `json:"reminder_days"`
 }
 
 // LoyaltySettingChange is one row of the loyalty settings history.
@@ -109,12 +123,21 @@ type OrganizationLoyaltySettingsView struct {
 	OrganizationLoyaltySettings
 	// What the balances in circulation are worth, before and after the change.
 	Impact LoyaltySettingsImpact `json:"impact"`
+	// When a balance received now would expire under these settings (F12).
+	ExpiryPreview LoyaltyExpiryPreview `json:"expiry_preview"`
 	// On PUT, the keys that changed; on a dry run, the keys that would.
 	Changes []LoyaltySettingChange `json:"changes"`
 	// True when nothing was saved.
 	DryRun bool `json:"dry_run"`
 }
 
+// LoyaltyExpiryPreview is what the dashboard shows next to the expiry settings: "the
+// EnakPoint received today expire on …". Nil means they never expire.
+type LoyaltyExpiryPreview struct {
+	Point *time.Time `json:"point"`
+	Coin  *time.Time `json:"coin"`
+}
+
 // LoyaltySettingsImpact shows how a change of point value or exchange rate changes what
 // the balances in circulation are worth (F2). Before and after are equal when neither
 // changes.

internal/processor/loyalty_expiry.go

@@ -0,0 +1,170 @@
+package processor
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+
+	"apskel-pos-be/internal/constants"
+	"apskel-pos-be/internal/models"
+)
+
+// Expiry rules of docs/prd-point-coin.md F12, with the model of note N4 decided: both
+// FIXED_DATE and ROLLING are supported and the owner picks one per currency.
+//
+// A lot expires at the last second of its expiry day in the customer's time zone, so
+// "expires on 31 Dec" means it can still be spent all of 31 Dec, and the day the apps
+// group it under is that day.
+
+const (
+	// A longer grace would push a balance past a whole cycle of fixed dates.
+	loyaltyExpiryMaxGraceMonths = 24
+	// A refund gives the EnakPoint back at least this long, even when the lot they
+	// came from has expired or is about to (note N4, decided).
+	refundMinimumValidity = 7 * 24 * time.Hour
+)
+
+// ExpirySettings picks the settings of one currency.
+func ExpirySettings(s *models.OrganizationLoyaltySettings, currency string) models.LoyaltyExpirySettings {
+	if currency == constants.WalletCurrencyCoin {
+		return s.CoinExpiry
+	}
+	return s.PointExpiry
+}
+
+// ComputeExpiry is when a balance received at receivedAt expires, or nil when it never
+// does because expiry is off. It is the expiry of every lot that is not carried over
+// from another one: EARN, ADJUSTMENT and, capped by its origin, EXCHANGE_IN.
+func ComputeExpiry(s models.LoyaltyExpirySettings, receivedAt time.Time) *time.Time {
+	if !s.Enabled {
+		return nil
+	}
+	day := walletDay(receivedAt)
+	if s.Mode == constants.LoyaltyExpiryModeRolling {
+		if s.Unit == constants.LoyaltyExpiryUnitDay {
+			day = day.AddDate(0, 0, int(s.Period))
+		} else {
+			day = addMonthsClamped(day, int(s.Period))
+		}
+		if s.EndOfMonth {
+			day = lastDayOfMonth(day)
+		}
+		return endOfWalletDay(day)
+	}
+	return endOfWalletDay(fixedDateOnOrAfter(s.FixedDates, addMonthsClamped(day, int(s.GraceMonths))))
+}
+
+// ActivationExpiry is the expiry given to the balances that already exist, without an
+// expiry, when expiry is turned on (note N4, decided): a full period from activation
+// when ROLLING, the second fixed date after activation when FIXED_DATE. Either way no
+// customer loses a balance soon after the rule is announced.
+func ActivationExpiry(s models.LoyaltyExpirySettings, at time.Time) *time.Time {
+	if s.Mode == constants.LoyaltyExpiryModeRolling {
+		s.Enabled = true
+		return ComputeExpiry(s, at)
+	}
+	first := fixedDateOnOrAfter(s.FixedDates, walletDay(at))
+	return endOfWalletDay(fixedDateOnOrAfter(s.FixedDates, first.AddDate(0, 0, 1)))
+}
+
+// RefundExpiry is the expiry of EnakPoint given back by a refund: that of the lot they
+// came from, but at least seven days from now (note N4, decided). A lot that never
+// expires stays so.
+func RefundExpiry(origin *time.Time, now time.Time) *time.Time {
+	if origin == nil {
+		return nil
+	}
+	minimum := endOfWalletDay(walletDay(now.Add(refundMinimumValidity)))
+	if origin.Before(*minimum) {
+		return minimum
+	}
+	return origin
+}
+
+// EarlierExpiry is the sooner of two expiries, where nil means never.
+func EarlierExpiry(a, b *time.Time) *time.Time {
+	switch {
+	case a == nil:
+		return b
+	case b == nil:
+		return a
+	case b.Before(*a):
+		return b
+	}
+	return a
+}
+
+// normalizeDaysOfYear checks days written as MM-DD and returns them sorted without
+// duplicates. 29 February is refused, as it does not come every year.
+func normalizeDaysOfYear(days []string) ([]string, error) {
+	seen := map[string]bool{}
+	var out []string
+	for _, d := range days {
+		d = strings.TrimSpace(d)
+		if d == "" {
+			continue
+		}
+		parsed, err := time.Parse("01-02", d)
+		if err != nil || parsed.Format("01-02") != d {
+			return nil, fmt.Errorf("has %q, which is not a day of the year written as MM-DD", d)
+		}
+		if d == "02-29" {
+			return nil, errors.New("cannot use 02-29, which is not in every year")
+		}
+		if !seen[d] {
+			seen[d] = true
+			out = append(out, d)
+		}
+	}
+	if len(out) == 0 {
+		return nil, errors.New("must list at least one day of the year, as MM-DD")
+	}
+	sort.Strings(out)
+	return out, nil
+}
+
+// fixedDateOnOrAfter is the first of the days of the year that falls on or after day.
+func fixedDateOnOrAfter(days []string, day time.Time) time.Time {
+	days, err := normalizeDaysOfYear(days)
+	if err != nil {
+		days = []string{constants.LoyaltyExpiryFixedDatesDefault}
+	}
+	for year := day.Year(); ; year++ {
+		for _, d := range days {
+			parsed, _ := time.Parse("01-02", d)
+			candidate := time.Date(year, parsed.Month(), parsed.Day(), 0, 0, 0, 0, walletDisplayLocation)
+			if !candidate.Before(day) {
+				return candidate
+			}
+		}
+	}
+}
+
+// walletDay is the calendar day of t in the customer's time zone, at midnight.
+func walletDay(t time.Time) time.Time {
+	local := t.In(walletDisplayLocation)
+	return time.Date(local.Year(), local.Month(), local.Day(), 0, 0, 0, 0, walletDisplayLocation)
+}
+
+func endOfWalletDay(day time.Time) *time.Time {
+	end := time.Date(day.Year(), day.Month(), day.Day(), 23, 59, 59, 0, walletDisplayLocation)
+	return &end
+}
+
+// addMonthsClamped adds months, keeping to the last day of a shorter month: 31 Jan
+// plus one month is 28 or 29 Feb, not 3 Mar.
+func addMonthsClamped(day time.Time, months int) time.Time {
+	first := time.Date(day.Year(), day.Month(), 1, 0, 0, 0, 0, day.Location()).AddDate(0, months, 0)
+	last := lastDayOfMonth(first).Day()
+	d := day.Day()
+	if d > last {
+		d = last
+	}
+	return time.Date(first.Year(), first.Month(), d, 0, 0, 0, 0, day.Location())
+}
+
+func lastDayOfMonth(day time.Time) time.Time {
+	return time.Date(day.Year(), day.Month()+1, 0, 0, 0, 0, 0, day.Location())
+}

internal/processor/loyalty_expiry_test.go

@@ -0,0 +1,115 @@
+package processor
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"apskel-pos-be/internal/models"
+)
+
+// wib is a moment in the customer's time zone.
+func wib(year int, month time.Month, day, hour, minute int) time.Time {
+	return time.Date(year, month, day, hour, minute, 0, 0, walletDisplayLocation)
+}
+
+// expiryDay is the day a lot expires on, as the apps show it.
+func expiryDay(t *testing.T, at *time.Time) string {
+	t.Helper()
+	require.NotNil(t, at)
+	local := at.In(walletDisplayLocation)
+	assert.Equal(t, "23:59:59", local.Format("15:04:05"), "a lot lasts to the end of its day")
+	return local.Format("2006-01-02")
+}
+
+func fixedDate(dates ...string) models.LoyaltyExpirySettings {
+	return models.LoyaltyExpirySettings{Enabled: true, Mode: "FIXED_DATE", FixedDates: dates, GraceMonths: 3}
+}
+
+func rolling(period int64, unit string, endOfMonth bool) models.LoyaltyExpirySettings {
+	return models.LoyaltyExpirySettings{Enabled: true, Mode: "ROLLING", Period: period, Unit: unit, EndOfMonth: endOfMonth}
+}
+
+func TestComputeExpiry_OffNeverExpires(t *testing.T) {
+	s := fixedDate("12-31")
+	s.Enabled = false
+	assert.Nil(t, ComputeExpiry(s, wib(2026, 5, 1, 10, 0)))
+}
+
+func TestComputeExpiry_FixedDateWithGrace(t *testing.T) {
+	yearly := fixedDate("12-31")
+	for received, want := range map[time.Time]string{
+		wib(2026, 1, 15, 9, 0):  "2026-12-31",
+		wib(2026, 9, 30, 23, 0): "2026-12-31", // 30 Dec + nothing: still this year
+		wib(2026, 10, 1, 0, 30): "2027-12-31", // within 3 months of 31 Dec: next year
+		wib(2026, 12, 31, 8, 0): "2027-12-31",
+	} {
+		assert.Equal(t, want, expiryDay(t, ComputeExpiry(yearly, received)), received.String())
+	}
+
+	twice := fixedDate("12-31", "06-30")
+	assert.Equal(t, "2026-06-30", expiryDay(t, ComputeExpiry(twice, wib(2026, 3, 1, 12, 0))))
+	assert.Equal(t, "2026-12-31", expiryDay(t, ComputeExpiry(twice, wib(2026, 4, 1, 12, 0))))
+	assert.Equal(t, "2027-06-30", expiryDay(t, ComputeExpiry(twice, wib(2026, 10, 1, 12, 0))))
+
+	noGrace := fixedDate("12-31")
+	noGrace.GraceMonths = 0
+	assert.Equal(t, "2026-12-31", expiryDay(t, ComputeExpiry(noGrace, wib(2026, 12, 31, 22, 0))))
+}
+
+// The day received is the customer's day: 20:00 UTC on 31 Mar is already 1 Apr in WIB.
+func TestComputeExpiry_UsesTheCustomersDay(t *testing.T) {
+	received := time.Date(2026, 3, 31, 20, 0, 0, 0, time.UTC)
+	assert.Equal(t, "2026-04-11", expiryDay(t, ComputeExpiry(rolling(10, "DAY", false), received)))
+}
+
+func TestComputeExpiry_Rolling(t *testing.T) {
+	assert.Equal(t, "2027-03-14", expiryDay(t, ComputeExpiry(rolling(12, "MONTH", false), wib(2026, 3, 14, 10, 0))))
+	assert.Equal(t, "2027-03-31", expiryDay(t, ComputeExpiry(rolling(12, "MONTH", true), wib(2026, 3, 14, 10, 0))))
+	assert.Equal(t, "2026-03-24", expiryDay(t, ComputeExpiry(rolling(10, "DAY", false), wib(2026, 3, 14, 10, 0))))
+	// A month that is shorter keeps to its last day.
+	assert.Equal(t, "2026-02-28", expiryDay(t, ComputeExpiry(rolling(1, "MONTH", false), wib(2026, 1, 31, 10, 0))))
+}
+
+func TestActivationExpiry(t *testing.T) {
+	// FIXED_DATE: the second fixed date after activation, so nobody loses a balance
+	// weeks after the rule is announced.
+	assert.Equal(t, "2027-12-31", expiryDay(t, ActivationExpiry(fixedDate("12-31"), wib(2026, 11, 20, 10, 0))))
+	assert.Equal(t, "2027-12-31", expiryDay(t, ActivationExpiry(fixedDate("12-31"), wib(2026, 12, 31, 10, 0))))
+	assert.Equal(t, "2027-06-30", expiryDay(t, ActivationExpiry(fixedDate("06-30", "12-31"), wib(2026, 11, 20, 10, 0))))
+	// ROLLING: a full period from activation.
+	assert.Equal(t, "2027-11-20", expiryDay(t, ActivationExpiry(rolling(12, "MONTH", false), wib(2026, 11, 20, 10, 0))))
+}
+
+func TestRefundExpiry(t *testing.T) {
+	now := wib(2026, 6, 1, 10, 0)
+	later := wib(2026, 12, 31, 23, 59)
+	soon := wib(2026, 6, 3, 23, 59)
+	past := wib(2026, 5, 1, 23, 59)
+
+	assert.Nil(t, RefundExpiry(nil, now))
+	assert.Equal(t, &later, RefundExpiry(&later, now))
+	assert.Equal(t, "2026-06-08", expiryDay(t, RefundExpiry(&soon, now)))
+	assert.Equal(t, "2026-06-08", expiryDay(t, RefundExpiry(&past, now)))
+}
+
+func TestEarlierExpiry(t *testing.T) {
+	a, b := wib(2026, 1, 1, 0, 0), wib(2026, 2, 1, 0, 0)
+	assert.Equal(t, &a, EarlierExpiry(&a, &b))
+	assert.Equal(t, &a, EarlierExpiry(&b, &a))
+	assert.Equal(t, &a, EarlierExpiry(nil, &a))
+	assert.Equal(t, &a, EarlierExpiry(&a, nil))
+	assert.Nil(t, EarlierExpiry(nil, nil))
+}
+
+func TestNormalizeDaysOfYear(t *testing.T) {
+	days, err := normalizeDaysOfYear([]string{" 12-31", "06-30", "12-31", ""})
+	require.NoError(t, err)
+	assert.Equal(t, []string{"06-30", "12-31"}, days)
+	for _, bad := range [][]string{{}, {"13-01"}, {"12-32"}, {"1-31"}, {"02-29"}, {"31-12"}} {
+		_, err := normalizeDaysOfYear(bad)
+		assert.Error(t, err, bad)
+	}
+}

internal/processor/loyalty_settings_processor.go

@@ -236,6 +236,10 @@ func organizationLoyaltyFields(s *models.OrganizationLoyaltySettings) []loyaltyF
 func expiryLoyaltyFields(prefix string, s *models.LoyaltyExpirySettings) []loyaltyField {
 	return []loyaltyField{
 		boolLoyaltyField(prefix+constants.LoyaltyExpiryEnabledSuffix, &s.Enabled, false),
+		enumLoyaltyField(prefix+constants.LoyaltyExpiryModeSuffix, &s.Mode, constants.LoyaltyExpiryModeDefault,
+			constants.LoyaltyExpiryModeFixedDate, constants.LoyaltyExpiryModeRolling),
+		dayOfYearListLoyaltyField(prefix+constants.LoyaltyExpiryFixedDatesSuffix, &s.FixedDates, constants.LoyaltyExpiryFixedDatesDefault),
+		intLoyaltyField(prefix+constants.LoyaltyExpiryGraceMonthsSuffix, &s.GraceMonths, constants.LoyaltyExpiryGraceMonthsDefault, 0, loyaltyExpiryMaxGraceMonths),
 		intLoyaltyField(prefix+constants.LoyaltyExpiryPeriodSuffix, &s.Period, constants.LoyaltyExpiryPeriodDefault, 1, noLoyaltyMax),
 		enumLoyaltyField(prefix+constants.LoyaltyExpiryUnitSuffix, &s.Unit, constants.LoyaltyExpiryUnitDefault,
 			constants.LoyaltyExpiryUnitDay, constants.LoyaltyExpiryUnitMonth),
@@ -362,6 +366,46 @@ func enumLoyaltyField(key string, v *string, def string, allowed ...string) loya
 	}
 }
 
+// dayOfYearListLoyaltyField is a non-empty set of days of the year, stored as sorted
+// MM-DD values joined by commas, such as "06-30,12-31".
+func dayOfYearListLoyaltyField(key string, v *[]string, def string) loyaltyField {
+	normalize := func(days []string) ([]string, error) {
+		out, err := normalizeDaysOfYear(days)
+		if err != nil {
+			return nil, fmt.Errorf("%w: %s %v", ErrInvalidLoyaltySettings, key, err)
+		}
+		return out, nil
+	}
+	return loyaltyField{
+		key: key,
+		parse: func(raw string) bool {
+			days, err := normalize(strings.Split(raw, ","))
+			if err != nil {
+				return false
+			}
+			*v = days
+			return true
+		},
+		reset: func() { *v, _ = normalizeDaysOfYear(strings.Split(def, ",")) },
+		validate: func() error {
+			days, err := normalize(*v)
+			if err != nil {
+				return err
+			}
+			*v = days
+			return nil
+		},
+		format: func() *string {
+			days, err := normalizeDaysOfYear(*v)
+			if err != nil {
+				days = *v
+			}
+			s := strings.Join(days, ",")
+			return &s
+		},
+	}
+}
+
 // loadLoyaltyFields fills each field from its stored value, or its default when there
 // is none. A stored value that cannot be used also falls back to the default, so a bad
 // row can never reach a calculation, and it is logged so it gets fixed.

internal/processor/loyalty_settings_processor_test.go

@@ -113,7 +113,7 @@ func TestLoyaltySettings_OrganizationWithoutSettingsGetsEveryDefault(t *testing.
 	p := NewLoyaltySettingsProcessor(&loyaltyRepoFake{}, txRunnerFake{})
 	s, err := p.Organization(context.Background(), uuid.New())
 	require.NoError(t, err)
-	expiry := models.LoyaltyExpirySettings{Enabled: false, Period: 12, Unit: "MONTH", EndOfMonth: false, ReminderDays: 7}
+	expiry := models.LoyaltyExpirySettings{Enabled: false, Mode: "FIXED_DATE", FixedDates: []string{"12-31"}, GraceMonths: 3, Period: 12, Unit: "MONTH", EndOfMonth: false, ReminderDays: 7}
 	assert.Equal(t, models.OrganizationLoyaltySettings{
 		PointValue:  1,
 		Exchange:    models.LoyaltyExchangeSettings{CoinAmount: 1, PointAmount: 1},
@@ -136,6 +136,8 @@ func TestLoyaltySettings_StoredValuesAreTyped(t *testing.T) {
 			constants.LoyaltyPointValueKey:         "100",
 			constants.LoyaltyTransferDailyLimitKey: "10000",
 			"loyalty.coin.expiry_unit":             "day",
+			"loyalty.point.expiry_fixed_dates":     "12-31, 06-30,12-31",
+			"loyalty.coin.expiry_mode":             "rolling",
 		},
 	}
 	p := NewLoyaltySettingsProcessor(repo, txRunnerFake{})
@@ -153,6 +155,9 @@ func TestLoyaltySettings_StoredValuesAreTyped(t *testing.T) {
 	assert.Equal(t, int64(10000), *org.Transfer.DailyLimit)
 	assert.Equal(t, "DAY", org.CoinExpiry.Unit)
 	assert.Equal(t, "MONTH", org.PointExpiry.Unit)
+	assert.Equal(t, []string{"06-30", "12-31"}, org.PointExpiry.FixedDates)
+	assert.Equal(t, "ROLLING", org.CoinExpiry.Mode)
+	assert.Equal(t, "FIXED_DATE", org.PointExpiry.Mode)
 }
 
 // A bad row must never reach a calculation: earn_per_amount 0 would divide by zero.
@@ -302,6 +307,11 @@ func TestLoyaltySettings_UpdateRejectsInvalidValues(t *testing.T) {
 		"expiry period 0":        func(s *models.OrganizationLoyaltySettings) { s.PointExpiry.Period = 0 },
 		"expiry unit YEAR":       func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.Unit = "YEAR" },
 		"negative reminder days": func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.ReminderDays = -1 },
+		"expiry mode YEARLY":     func(s *models.OrganizationLoyaltySettings) { s.PointExpiry.Mode = "YEARLY" },
+		"no fixed dates":         func(s *models.OrganizationLoyaltySettings) { s.PointExpiry.FixedDates = nil },
+		"fixed date 13-01":       func(s *models.OrganizationLoyaltySettings) { s.PointExpiry.FixedDates = []string{"13-01"} },
+		"fixed date 02-29":       func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.FixedDates = []string{"02-29"} },
+		"negative grace":         func(s *models.OrganizationLoyaltySettings) { s.CoinExpiry.GraceMonths = -1 },
 	} {
 		s, err := p.Organization(ctx, org)
 		require.NoError(t, err)

internal/service/loyalty_settings_service.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"time"
 
 	"github.com/google/uuid"
 
@@ -144,9 +145,10 @@ func (s *LoyaltySettingsServiceImpl) GetOrganizationSettings(ctx context.Context
 // of the GET response, which are ignored.
 type organizationSettingsInput struct {
 	*models.OrganizationLoyaltySettings
-	Impact  json.RawMessage `json:"impact"`
-	Changes json.RawMessage `json:"changes"`
-	DryRun  json.RawMessage `json:"dry_run"`
+	Impact        json.RawMessage `json:"impact"`
+	ExpiryPreview json.RawMessage `json:"expiry_preview"`
+	Changes       json.RawMessage `json:"changes"`
+	DryRun        json.RawMessage `json:"dry_run"`
 }
 
 func (s *LoyaltySettingsServiceImpl) UpdateOrganizationSettings(ctx context.Context, apctx *appcontext.ContextInfo, body []byte, dryRun bool) *contract.Response {
@@ -196,6 +198,7 @@ func (s *LoyaltySettingsServiceImpl) ListHistory(ctx context.Context, apctx *app
 }
 
 func (s *LoyaltySettingsServiceImpl) organizationView(ctx context.Context, organizationID uuid.UUID, before, after models.OrganizationLoyaltySettings, changes []models.LoyaltySettingChange, dryRun bool) (*models.OrganizationLoyaltySettingsView, error) {
+	now := time.Now()
 	points, coins, err := s.outstanding.OrganizationOutstanding(ctx, organizationID)
 	if err != nil {
 		return nil, err
@@ -206,7 +209,11 @@ func (s *LoyaltySettingsServiceImpl) organizationView(ctx context.Context, organ
 	return &models.OrganizationLoyaltySettingsView{
 		OrganizationLoyaltySettings: after,
 		Impact:                      models.NewLoyaltySettingsImpact(points, coins, before, after),
-		Changes:                     changes,
-		DryRun:                      dryRun,
+		ExpiryPreview: models.LoyaltyExpiryPreview{
+			Point: processor.ComputeExpiry(after.PointExpiry, now),
+			Coin:  processor.ComputeExpiry(after.CoinExpiry, now),
+		},
+		Changes: changes,
+		DryRun:  dryRun,
 	}, nil
 }