diff --git a/src/Domain/Models/ValueObjects/Period.php b/src/Domain/Models/ValueObjects/Period.php
index 9e75316..af6559f 100644
--- a/src/Domain/Models/ValueObjects/Period.php
+++ b/src/Domain/Models/ValueObjects/Period.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Domain\Models\ValueObjects\RequestedCoupon;
+namespace Domain\Models\ValueObjects;
 
 use Shared\ValueObjects\DateTime;
 
diff --git a/src/Domain/Enums/Currency.php b/src/Shared/Enums/Currency.php
similarity index 100%
rename from src/Domain/Enums/Currency.php
rename to src/Shared/Enums/Currency.php
diff --git a/tests/Unit/Domain/Enums/CountryTest.php b/tests/Unit/Domain/Enums/CountryTest.php
new file mode 100644
index 0000000..e9c49c6
--- /dev/null
+++ b/tests/Unit/Domain/Enums/CountryTest.php
@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Shared\Enums;
+
+use Domain\Enums\Country;
+
+covers(Country::class);
+
+describe('country', function (): void {
+    it('has the expected cases with their backing values', function (): void {
+        // THEN
+        expect(Country::FR->value())->toBe(1)
+            ->and(Country::BE->value())->toBe(2)
+            ->and(Country::LU->value())->toBe(3);
+    });
+
+    it('exposes its case name', function (): void {
+        // THEN
+        expect(Country::FR->name())->toBe('FR');
+    });
+
+    it('returns the defined label', function (): void {
+        // THEN
+        expect(Country::FR->label())->toBe('FR')
+            ->and(Country::BE->label())->toBe('BE')
+            ->and(Country::LU->label())->toBe('LU');
+    });
+
+    it('lists all labels keyed by case name', function (): void {
+        // THEN
+        expect(Country::toLabels())->toBe([
+            'FR' => 'FR',
+            'BE' => 'BE',
+            'LU' => 'LU',
+        ]);
+    });
+
+    it('lists all values keyed by case name', function (): void {
+        // THEN
+        expect(Country::toValues())->toBe([
+            'FR' => 1,
+            'BE' => 2,
+            'LU' => 3,
+        ]);
+    });
+
+    it('makes an instance from its backing value', function (): void {
+        // THEN
+        expect(Country::make(1))->toBe(Country::FR);
+    });
+
+    it('makes an instance from a label', function (): void {
+        // THEN
+        expect(Country::make('BE', 'label'))->toBe(Country::BE);
+    });
+
+    it('returns the same instance when already an enum case', function (): void {
+        // THEN
+        expect(Country::make(Country::LU))->toBe(Country::LU);
+    });
+
+    it('returns null for an unknown value', function (): void {
+        // THEN
+        expect(Country::make(99))->toBeNull();
+    });
+
+    it('implements equals correctly', function (): void {
+        // THEN
+        expect(Country::FR->equals(Country::FR))->toBeTrue()
+            ->and(Country::FR->equals(Country::BE))->toBeFalse()
+            ->and(Country::FR->equals(null))->toBeFalse();
+    });
+
+    it('serializes to json as its backing value', function (): void {
+        // THEN
+        expect(Country::FR->jsonSerialize())->toBe(1)
+            ->and(json_encode(Country::FR))->toBe('1');
+    });
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/MoneyAmountTest.php b/tests/Unit/Domain/Models/ValueObjects/MoneyAmountTest.php
new file mode 100644
index 0000000..089ee70
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/MoneyAmountTest.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\MoneyAmount;
+use Shared\Enums\Currency;
+use Shared\ValueObjects\Money;
+
+covers(MoneyAmount::class);
+
+describe('money amount', function (): void {
+    it('wraps a Money value', function (): void {
+        // GIVEN
+        $money = new Money(Currency::EUR, 300);
+
+        // WHEN
+        $amount = new MoneyAmount($money);
+
+        // THEN
+        expect($amount)->toBeInstanceOf(MoneyAmount::class)
+            ->and($amount->value)->toBe($money);
+    });
+
+    it('implements equals by delegating to the wrapped Money', function (): void {
+        // GIVEN
+        $amount1 = new MoneyAmount(new Money(Currency::EUR, 300));
+        $amount2 = new MoneyAmount(new Money(Currency::EUR, 300));
+        $amount3 = new MoneyAmount(new Money(Currency::EUR, 500));
+
+        // THEN
+        expect($amount1->equals($amount2))->toBeTrue()
+            ->and($amount1->equals($amount3))->toBeFalse()
+            ->and($amount1->equals(null))->toBeFalse();
+    });
+
+    it('converts to string by delegating to the wrapped Money', function (): void {
+        // GIVEN
+        $amount = new MoneyAmount(new Money(Currency::EUR, 300));
+
+        // THEN
+        expect((string) $amount)->toBe((string) $amount->value);
+    });
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/RequestedCoupon/PeriodTest.php b/tests/Unit/Domain/Models/ValueObjects/RequestedCoupon/PeriodTest.php
new file mode 100644
index 0000000..20ff709
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/RequestedCoupon/PeriodTest.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects\RequestedCoupon;
+
+use Domain\Models\ValueObjects\Period;
+use Shared\ValueObjects\DateTime;
+
+covers(Period::class);
+
+describe('period', function (): void {
+    it('creates a valid period', function (): void {
+        // GIVEN
+        $start = new DateTime('2026-01-01');
+        $end   = new DateTime('2026-01-31');
+
+        // WHEN
+        $period = new Period($start, $end);
+
+        // THEN
+        expect($period)->toBeInstanceOf(Period::class)
+            ->and($period->start)->toBe($start)
+            ->and($period->end)->toBe($end);
+    });
+});
diff --git a/tests/Unit/Shared/Enums/CurrencyTest.php b/tests/Unit/Shared/Enums/CurrencyTest.php
new file mode 100644
index 0000000..0f01dd3
--- /dev/null
+++ b/tests/Unit/Shared/Enums/CurrencyTest.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Shared\Enums;
+
+use Shared\Enums\Currency;
+
+covers(Currency::class);
+
+describe('currency', function (): void {
+    it('has the expected cases with their backing values', function (): void {
+        // THEN
+        expect(Currency::EUR->value())->toBe(1);
+    });
+
+    it('exposes its case name', function (): void {
+        // THEN
+        expect(Currency::EUR->name())->toBe('EUR');
+    });
+
+    it('returns the defined label', function (): void {
+        // THEN
+        expect(Currency::EUR->label())->toBe('Euro');
+    });
+
+    it('lists all labels keyed by case name', function (): void {
+        // THEN
+        expect(Currency::toLabels())->toBe([
+            'EUR' => 'Euro',
+        ]);
+    });
+
+    it('lists all values keyed by case name', function (): void {
+        // THEN
+        expect(Currency::toValues())->toBe([
+            'EUR' => 1,
+        ]);
+    });
+
+    it('makes an instance from its backing value', function (): void {
+        // THEN
+        expect(Currency::make(1))->toBe(Currency::EUR);
+    });
+
+    it('makes an instance from a label', function (): void {
+        // THEN
+        expect(Currency::make('Euro', 'label'))->toBe(Currency::EUR);
+    });
+
+    it('returns the same instance when already an enum case', function (): void {
+        // THEN
+        expect(Currency::make(Currency::EUR))->toBe(Currency::EUR);
+    });
+
+    it('returns null for an unknown value', function (): void {
+        // THEN
+        expect(Currency::make(99))->toBeNull();
+    });
+
+    it('implements equals correctly', function (): void {
+        // THEN
+        expect(Currency::EUR->equals(Currency::EUR))->toBeTrue()
+            ->and(Currency::EUR->equals(null))->toBeFalse();
+    });
+});
diff --git a/tests/Unit/Shared/ValueObjects/DateTimeTest.php b/tests/Unit/Shared/ValueObjects/DateTimeTest.php
new file mode 100644
index 0000000..d028cdd
--- /dev/null
+++ b/tests/Unit/Shared/ValueObjects/DateTimeTest.php
@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Shared\ValueObjects;
+
+use Shared\Helpers\DatesHelper;
+use Shared\Helpers\Exceptions\InvalidDateFormatException;
+use Shared\ValueObjects\DateTime;
+
+covers(DateTime::class);
+
+describe('date time', function (): void {
+    it('accepts a DateTimeInterface instance and normalizes it to UTC', function (): void {
+        // GIVEN
+        $paris = new \DateTimeImmutable('2026-06-15 14:00:00', new \DateTimeZone('Europe/Paris'));
+
+        // WHEN
+        $dateTime = new DateTime($paris);
+
+        // THEN
+        expect($dateTime->value)->toBeInstanceOf(\DateTimeImmutable::class)
+            ->and($dateTime->value->getTimezone()->getName())->toBe('UTC')
+            ->and($dateTime->value->format('H:i:s'))->toBe('12:00:00');
+    });
+
+    it('parses a valid date string', function (): void {
+        // WHEN
+        $dateTime = new DateTime('2026-01-15');
+
+        // THEN
+        expect($dateTime->value->format('Y-m-d'))->toBe('2026-01-15');
+    });
+
+    it('rejects an invalid date string', function (): void {
+        // WHEN
+        $action = fn (): DateTime => new DateTime('not-a-date');
+
+        // THEN
+        expect($action)->toThrow(InvalidDateFormatException::class);
+    });
+
+    it('creates the current instant via now', function (): void {
+        // GIVEN
+        \Carbon\CarbonImmutable::setTestNow('2026-06-15T12:00:00Z');
+
+        // WHEN
+        $dateTime = DateTime::now();
+
+        // THEN
+        expect($dateTime)->toBeInstanceOf(DateTime::class)
+            ->and($dateTime->value->getTimezone()->getName())->toBe('UTC')
+            ->and($dateTime->value->format(\DateTimeInterface::ATOM))->toBe('2026-06-15T12:00:00+00:00');
+
+        // TEARDOWN
+        \Carbon\CarbonImmutable::setTestNow();
+    });
+
+    it('implements equals correctly', function (): void {
+        // GIVEN
+        $a = new DateTime('2026-01-15T10:00:00Z');
+        $b = new DateTime('2026-01-15T10:00:00Z');
+        $c = new DateTime('2026-01-16T10:00:00Z');
+
+        // THEN
+        expect($a->equals($b))->toBeTrue()
+            ->and($a->equals($c))->toBeFalse()
+            ->and($a->equals(null))->toBeFalse();
+    });
+
+    it('converts to a RFC3339 string', function (): void {
+        // GIVEN
+        $dateTime = new DateTime('2026-01-15T10:00:00Z');
+
+        // THEN
+        expect((string) $dateTime)->toBe(DatesHelper::toRfc3339($dateTime->value));
+    });
+
+    it('serializes to json as a RFC3339 string', function (): void {
+        // GIVEN
+        $dateTime = new DateTime('2026-01-15T10:00:00Z');
+
+        // THEN
+        expect($dateTime->jsonSerialize())->toBe((string) $dateTime);
+    });
+});
diff --git a/tests/Unit/Shared/ValueObjects/MoneyTest.php b/tests/Unit/Shared/ValueObjects/MoneyTest.php
new file mode 100644
index 0000000..e6bd56e
--- /dev/null
+++ b/tests/Unit/Shared/ValueObjects/MoneyTest.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Shared\ValueObjects;
+
+use Shared\Enums\Currency;
+use Shared\ValueObjects\Money;
+
+covers(Money::class);
+
+describe('money', function (): void {
+    it('creates a valid money value', function (): void {
+        // GIVEN
+        $value = 300;
+
+        // WHEN
+        $money = new Money(Currency::EUR, $value);
+
+        // THEN
+        expect($money)->toBeInstanceOf(Money::class)
+            ->and($money->currency)->toBe(Currency::EUR)
+            ->and($money->value)->toBe($value);
+    });
+
+    it('accepts a zero value', function (): void {
+        // WHEN
+        $money = new Money(Currency::EUR, 0);
+
+        // THEN
+        expect($money->value)->toBe(0);
+    });
+
+    it('rejects a negative value', function (): void {
+        // WHEN
+        $action = fn (): Money => new Money(Currency::EUR, -1);
+
+        // THEN
+        expect($action)->toThrow(\DomainException::class, 'Money value cannot be negative.');
+    });
+
+    it('implements equals correctly', function (): void {
+        // GIVEN
+        $money1 = new Money(Currency::EUR, 300);
+        $money2 = new Money(Currency::EUR, 300);
+        $money3 = new Money(Currency::EUR, 500);
+
+        // THEN
+        expect($money1->equals($money2))->toBeTrue()
+            ->and($money1->equals($money3))->toBeFalse()
+            ->and($money1->equals(null))->toBeFalse();
+    });
+
+    it('converts to string', function (): void {
+        // GIVEN
+        $money = new Money(Currency::EUR, 300);
+
+        // THEN
+        expect((string) $money)->toBe('300 EUR');
+    });
+});