diff --git a/Changelog.md b/Changelog.md
index 7c6b138..ed61fb5 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -2,6 +2,18 @@
 
 ## 4.x Series
 
+## Unreleased
+##### 2024-XX-YY
+
+- Added the following, v5 interface candidate methods to the Checkout implementations:
+  - `addCoupon()`
+  - `removeCoupon()`
+  - `hasCoupon()`
+  - `getCoupons()`
+  - `hasAnyCoupon()`
+  - `getPromotionsAmount()`
+  - `setPromotionsAmount()`
+
 ## 4.1.0
 ##### 2024-07-11
 
diff --git a/Contracts/Checkout.php b/Contracts/Checkout.php
index 75d60fd..3087833 100644
--- a/Contracts/Checkout.php
+++ b/Contracts/Checkout.php
@@ -83,6 +83,9 @@ public function setTaxesAmount(float|DetailedAmount $amount): void;
      * public function removeCoupon(string $couponCode): void;
      * public function hasCoupon(string $couponCode): bool;
      * public function getCoupons(): array;
+     * public function hasAnyCoupon(): bool;
+     * public function getPromotionsAmount(): DetailedAmount;
+     * public function setPromotionsAmount(float|DetailedAmount $amount): void;
      */
 
     public function itemsTotal(): float;
diff --git a/Drivers/BaseCheckoutStore.php b/Drivers/BaseCheckoutStore.php
index c18bc3b..8397d23 100644
--- a/Drivers/BaseCheckoutStore.php
+++ b/Drivers/BaseCheckoutStore.php
@@ -196,14 +196,19 @@ public function removeCoupon(string $couponCode): void
         Event::dispatch(new CouponRemoved($this, $couponCode));
     }
 
+    public function hasAnyCoupon(): bool
+    {
+        return 0 !== count($this->getCoupons());
+    }
+
     public function hasCoupon(string $couponCode): bool
     {
-        in_array($couponCode, $this->getCoupons());
+        return in_array($couponCode, $this->getCoupons());
     }
 
     public function getCoupons(): array
     {
-        Arr::wrap($this->readRawDataFromStore('coupons'));
+        return Arr::wrap($this->readRawDataFromStore('coupons'));
     }
 
     public function weight(): float
diff --git a/Drivers/RequestStore.php b/Drivers/RequestStore.php
index e1403d6..fd62171 100644
--- a/Drivers/RequestStore.php
+++ b/Drivers/RequestStore.php
@@ -55,6 +55,8 @@ class RequestStore extends BaseCheckoutStore
 
     protected DetailedAmount $taxes;
 
+    protected DetailedAmount $promotions;
+
     protected CheckoutRequest $request;
 
     /** @var array */
@@ -71,6 +73,7 @@ public function __construct(CheckoutDataFactory $dataFactory, Request|CheckoutRe
         }
         $this->taxes = new DetailedAmountDto(0);
         $this->shippingFees = new DetailedAmountDto(0);
+        $this->promotions = new DetailedAmountDto(0);
     }
 
     /**
@@ -127,6 +130,16 @@ public function setTaxesAmount(float|DetailedAmount $amount): void
         $this->taxes = $amount instanceof DetailedAmount ? $amount : new DetailedAmountDto($amount);
     }
 
+    public function getPromotionsAmount(): DetailedAmount
+    {
+        return $this->promotions;
+    }
+
+    public function setPromotionsAmount(float|DetailedAmount $amount): void
+    {
+        $this->promotions = $amount instanceof DetailedAmount ? $amount : new DetailedAmountDto($amount);
+    }
+
     public function setCustomAttribute(string $key, $value): void
     {
         Arr::set($this->customData, $key, $value);
diff --git a/Drivers/SessionStore.php b/Drivers/SessionStore.php
index 4ab15a1..d4d759a 100644
--- a/Drivers/SessionStore.php
+++ b/Drivers/SessionStore.php
@@ -98,6 +98,16 @@ public function setTaxesAmount(float|DetailedAmount $amount): void
         $this->writeRawDataToStore('taxes', $amount);
     }
 
+    public function getPromotionsAmount(): DetailedAmount
+    {
+        return $this->getDetailedAmountAttribute('promotions');
+    }
+
+    public function setPromotionsAmount(float|DetailedAmount $amount): void
+    {
+        $this->setDetailedAmountAttribute('promotions', $amount);
+    }
+
     public function setCustomAttribute(string $key, $value): void
     {
         $customAttributes = $this->getCustomAttributes();
@@ -140,6 +150,23 @@ public function clear(): void
         $this->session->forget($this->prefix);
     }
 
+    public function getDetailedAmountAttribute(string $name): DetailedAmount
+    {
+        $raw = $this->readRawDataFromStore($name, []);
+
+        return is_array($raw) ?
+            DetailedAmountDto::fromArray($raw) : new DetailedAmountDto(is_numeric($raw) ? floatval($raw) : 0);
+    }
+
+    public function setDetailedAmountAttribute(string $name, float|DetailedAmount $amount): void
+    {
+        if ($amount instanceof DetailedAmount && empty($amount->getDetails())) {
+            $amount = $amount->getValue();//Otherwise the value gets lost
+        }
+
+        $this->writeRawDataToStore($name, $amount);
+    }
+
     protected function readRawDataFromStore(string $key, $default = null): mixed
     {
         return $this->session->get($this->prefix . '.' . $key, $default);