diff --git a/README.md b/README.md
index fc3d696..cabd269 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,13 @@ Returns information for the cart for the authenticated customer. Must use a sing
 Magento::api('carts')->mine();
 ```
 
+`/V1/carts/mine/coupons/{couponCode}`
+
+Apply a coupon to a specified cart.
+```php
+Magento::api('carts')->couponCode($couponCode);
+```
+
 #### Cart Items (quoteCartItemRepositoryV1)
 
 `/V1/carts/mine/items/`
@@ -225,6 +232,13 @@ Estimate shipping by address and return list of available shipping methods.
 Magento::api('guestCarts')->estimateShippingMethods($cartId);
 ```
 
+`/V1/guest-carts/{cartId}/coupons/{couponCode}`
+
+Apply a coupon to a specified cart.
+```php
+Magento::api('guestCarts')->couponCode($cartId, $couponCode);
+```
+
 <a id="orders"></a>
 ### Orders (salesOrderRepositoryV1)
 
diff --git a/src/Api/Carts.php b/src/Api/Carts.php
index fe60026..2f7d164 100644
--- a/src/Api/Carts.php
+++ b/src/Api/Carts.php
@@ -91,4 +91,25 @@ public function paymentInformation($body = [])
 
         return $this->post('/carts/mine/payment-information', $body);
     }
+
+    /**
+     * Apply a coupon to a specified cart.
+     *
+     * @param  string  $couponCode
+     * @return void
+     */
+    public function couponCode($couponCode)
+    {
+        return $this->put('/carts/mine/coupons/'.$couponCode);
+    }
+
+    /**
+     * Removes coupon(s) from specified cart.
+     *
+     * @return void
+     */
+    public function removeCoupons()
+    {
+        return $this->delete('/carts/mine/coupons');
+    }
 }
diff --git a/src/Api/GuestCarts.php b/src/Api/GuestCarts.php
index 00a49bd..b1d5776 100644
--- a/src/Api/GuestCarts.php
+++ b/src/Api/GuestCarts.php
@@ -133,4 +133,26 @@ public function removeItem($cartId, $itemId)
     {
         return $this->delete('/guest-carts/'.$cartId.'/items/'.$itemId);
     }
+
+    /**
+     * Apply a coupon to a specified cart.
+     *
+     * @param  string  $cartId
+     * @param  string  $couponCode
+     * @return void
+     */
+    public function couponCode($cartId, $couponCode)
+    {
+        return $this->put('/guest-carts/'.$cartId.'/coupons/'.$couponCode);
+    }
+
+    /**
+     * Removes coupon(s) from specified cart.
+     *
+     * @return void
+     */
+    public function removeCoupons($cartId)
+    {
+        return $this->delete('/guest-carts/'.$cartId.'/coupons');
+    }
 }
diff --git a/tests/Api/CartsTest.php b/tests/Api/CartsTest.php
index 8109178..c5cfe5c 100644
--- a/tests/Api/CartsTest.php
+++ b/tests/Api/CartsTest.php
@@ -129,4 +129,26 @@ public function test_must_pass_a_single_store_code_to_payment_information()
 
         MagentoFacade::api('carts')->paymentInformation([]);
     }
+
+    public function test_can_add_coupon_code()
+    {
+        Http::fake([
+            '*rest/default/V1/carts/mine/coupons/foo' => Http::response('foo', 200),
+        ]);
+
+        $api = MagentoFacade::setStoreCode('default')->api('carts')->couponCode('foo');
+
+        $this->assertTrue($api->ok());
+    }
+
+    public function test_can_remove_coupon_code()
+    {
+        Http::fake([
+            '*rest/default/V1/carts/mine/coupons' => Http::response('foo', 200),
+        ]);
+
+        $api = MagentoFacade::setStoreCode('default')->api('carts')->removeCoupons();
+
+        $this->assertTrue($api->ok());
+    }
 }
diff --git a/tests/Api/GuestCartsTest.php b/tests/Api/GuestCartsTest.php
index ef5b24a..a840c88 100644
--- a/tests/Api/GuestCartsTest.php
+++ b/tests/Api/GuestCartsTest.php
@@ -123,4 +123,26 @@ public function test_can_remove_items_from_cart()
 
         $this->assertTrue($api->ok());
     }
+
+    public function test_can_add_coupon()
+    {
+        Http::fake([
+            '*rest/all/V1/guest-carts/foo/coupons/bar' => Http::response([], 200),
+        ]);
+
+        $api = MagentoFacade::api('guestCarts')->couponCode('foo', 'bar');
+
+        $this->assertTrue($api->ok());
+    }
+
+    public function test_can_remove_coupon()
+    {
+        Http::fake([
+            '*rest/all/V1/guest-carts/foo/coupons' => Http::response([], 200),
+        ]);
+
+        $api = MagentoFacade::api('guestCarts')->removeCoupons('foo');
+
+        $this->assertTrue($api->ok());
+    }
 }