diff --git a/Changelog.md b/Changelog.md
index 4551ed44..2a932f73 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -69,6 +69,15 @@
 - BC: Added the void return type to `Checkout::setShippingAddress()`
 - BC: Added the following methods to the Checkout interface:
     - `removeShippingAddress()`
+    - `getShipToBillingAddress()`
+    - `setShipToBillingAddress()`
+    - `getShippingMethodId()`
+    - `setShippingMethodId()`
+    - `getPaymentMethodId()`
+    - `setPaymentMethodId()`
+    - `getNotes()`
+    - `setNotes()`
+    - `clear()`
     - `getShippingAmount()`
     - `setShippingAmount()`
     - `getTaxesAmount()`
diff --git a/src/Checkout/Changelog.md b/src/Checkout/Changelog.md
index f5f37cd9..eaf13208 100644
--- a/src/Checkout/Changelog.md
+++ b/src/Checkout/Changelog.md
@@ -24,6 +24,15 @@
 - BC: Added the void return type to `Checkout::setShippingAddress()`
 - BC: Added the following methods to the Checkout interface:
   - `removeShippingAddress()`
+  - `getShipToBillingAddress()`
+  - `setShipToBillingAddress()`
+  - `getShippingMethodId()`
+  - `setShippingMethodId()`
+  - `getPaymentMethodId()`
+  - `setPaymentMethodId()`
+  - `getNotes()`
+  - `setNotes()`
+  - `clear()`
   - `getShippingAmount()`
   - `setShippingAmount()`
   - `getTaxesAmount()`
diff --git a/src/Checkout/CheckoutManager.php b/src/Checkout/CheckoutManager.php
index 897cd09b..124fa4d4 100644
--- a/src/Checkout/CheckoutManager.php
+++ b/src/Checkout/CheckoutManager.php
@@ -109,6 +109,51 @@ public function removeShippingAddress(): void
         $this->store->removeShippingAddress();
     }
 
+    public function getShipToBillingAddress(bool $default = true): bool
+    {
+        return $this->store->getShipToBillingAddress($default);
+    }
+
+    public function setShipToBillingAddress(bool $value): void
+    {
+        $this->store->setShipToBillingAddress($value);
+    }
+
+    public function getShippingMethodId(): null|int|string
+    {
+        return $this->store->getShippingMethodId();
+    }
+
+    public function setShippingMethodId(int|string|null $shippingMethodId): void
+    {
+        $this->store->setShippingMethodId($shippingMethodId);
+    }
+
+    public function getPaymentMethodId(): null|int|string
+    {
+        return $this->store->getPaymentMethodId();
+    }
+
+    public function setPaymentMethodId(int|string|null $paymentMethodId): void
+    {
+        $this->store->setPaymentMethodId($paymentMethodId);
+    }
+
+    public function getNotes(): ?string
+    {
+        return $this->store->getNotes();
+    }
+
+    public function setNotes(?string $text): void
+    {
+        $this->store->setNotes($text);
+    }
+
+    public function clear(): void
+    {
+        $this->store->clear();
+    }
+
     public function setCustomAttribute(string $key, $value): void
     {
         $this->store->setCustomAttribute($key, $value);
diff --git a/src/Checkout/Contracts/Checkout.php b/src/Checkout/Contracts/Checkout.php
index d08fcbe9..410ff6fa 100644
--- a/src/Checkout/Contracts/Checkout.php
+++ b/src/Checkout/Contracts/Checkout.php
@@ -25,18 +25,8 @@ interface Checkout extends Shippable, ArrayAccess
 {
     public function getCart(): ?CheckoutSubject;
 
-    /**
-     * Set the cart for the checkout
-     *
-     * @param CheckoutSubject $cart
-     */
     public function setCart(CheckoutSubject $cart);
 
-    /**
-     * Returns the state of the checkout
-     *
-     * @return CheckoutState
-     */
     public function getState(): CheckoutState;
 
     /**
@@ -46,26 +36,32 @@ public function getState(): CheckoutState;
      */
     public function setState($state);
 
-    /**
-     * Returns the bill payer details
-     *
-     * @return Billpayer
-     */
     public function getBillpayer(): Billpayer;
 
-    /**
-     * Sets the bill payer details
-     *
-     * @param Billpayer $billpayer
-     */
     public function setBillpayer(Billpayer $billpayer);
 
-    public function getShippingAddress(): ?Address;
-
     public function setShippingAddress(Address $address): void;
 
     public function removeShippingAddress(): void;
 
+    public function getShipToBillingAddress(bool $default = true): bool;
+
+    public function setShipToBillingAddress(bool $value): void;
+
+    public function getShippingMethodId(): null|int|string;
+
+    public function setShippingMethodId(null|int|string $shippingMethodId): void;
+
+    public function getPaymentMethodId(): null|int|string;
+
+    public function setPaymentMethodId(null|int|string $paymentMethodId): void;
+
+    public function getNotes(): ?string;
+
+    public function setNotes(?string $text): void;
+
+    public function clear(): void;
+
     public function setCustomAttribute(string $key, $value): void;
 
     public function getCustomAttribute(string $key);
@@ -93,10 +89,5 @@ public function itemsTotal(): float;
      */
     public function update(array $data);
 
-    /**
-     * Returns the grand total of the checkout
-     *
-     * @return float
-     */
     public function total();
 }
diff --git a/src/Checkout/Drivers/BaseCheckoutStore.php b/src/Checkout/Drivers/BaseCheckoutStore.php
index 3e794cf6..eda9ff34 100644
--- a/src/Checkout/Drivers/BaseCheckoutStore.php
+++ b/src/Checkout/Drivers/BaseCheckoutStore.php
@@ -207,16 +207,6 @@ public function offsetGet(mixed $offset): mixed
         }
     }
 
-    abstract public function clear(): void;
-
-    abstract public function getShippingAmount(): DetailedAmount;
-
-    abstract public function setShippingAmount(float|DetailedAmount $amount): void;
-
-    abstract public function getTaxesAmount(): DetailedAmount;
-
-    abstract public function setTaxesAmount(float|DetailedAmount $amount): void;
-
     protected function getShipToName(Billpayer $billpayer): string
     {
         if ($billpayer->isOrganization()) {
diff --git a/src/Checkout/Tests/Example/MemoryStore.php b/src/Checkout/Tests/Example/MemoryStore.php
index 400da435..20b60a3f 100644
--- a/src/Checkout/Tests/Example/MemoryStore.php
+++ b/src/Checkout/Tests/Example/MemoryStore.php
@@ -133,6 +133,51 @@ public function setTaxesAmount(float|DetailedAmount $amount): void
         // TODO: Implement setTaxesAmount() method.
     }
 
+    public function getShipToBillingAddress(bool $default = true): bool
+    {
+        // TODO: Implement getShipToBillingAddress() method.
+    }
+
+    public function setShipToBillingAddress(bool $value): void
+    {
+        // TODO: Implement setShipToBillingAddress() method.
+    }
+
+    public function getShippingMethodId(): null|int|string
+    {
+        // TODO: Implement getShippingMethodId() method.
+    }
+
+    public function setShippingMethodId(int|string|null $shippingMethodId): void
+    {
+        // TODO: Implement setShippingMethodId() method.
+    }
+
+    public function getPaymentMethodId(): null|int|string
+    {
+        // TODO: Implement getPaymentMethodId() method.
+    }
+
+    public function setPaymentMethodId(int|string|null $paymentMethodId): void
+    {
+        // TODO: Implement setPaymentMethodId() method.
+    }
+
+    public function getNotes(): ?string
+    {
+        // TODO: Implement getNotes() method.
+    }
+
+    public function setNotes(?string $text): void
+    {
+        // TODO: Implement setNotes() method.
+    }
+
+    public function clear(): void
+    {
+        // TODO: Implement clear() method.
+    }
+
     public function update(array $data)
     {
         // TODO: Implement update() method.