feat: add endpoint to get guest carts total information

Author: ahinkle

src/Api/GuestCarts.php

@@ -74,4 +74,16 @@ public function estimateShippingMethods($cartId, $body = [])
     {
         return $this->post('/guest-carts/'.$cartId.'/estimate-shipping-methods', $body);
     }
+
+    /**
+     * Calculate quote totals based on address and shipping method.
+     *
+     * @param  string $cartId
+     * @param  array  $body
+     * @return array
+     */
+    public function totalsInformation($cartId, $body = [])
+    {
+        return $this->post('/guest-carts/'.$cartId.'/totals-information', $body);
+    }
 }

tests/Api/GuestCartsTest.php

@@ -82,4 +82,17 @@ public function test_can_call_guest_carts_estimate_shipping_methods()
 
         $this->assertTrue($api->ok());
     }
+
+    public function test_can_call_guest_carts_totals_information()
+    {
+        Http::fake([
+            '*rest/all/V1/guest-carts/foo/totals-information' => Http::response([], 200),
+        ]);
+
+        $magento = new Magento();
+
+        $api = $magento->api('guestCarts')->totalsInformation('foo');
+
+        $this->assertTrue($api->ok());
+    }
 }