diff --git a/contracts/documentation.yaml b/contracts/documentation.yaml
index 4841715..6fe1f5e 100644
--- a/contracts/documentation.yaml
+++ b/contracts/documentation.yaml
@@ -102,6 +102,23 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/Product'
+        '400':
+          description: Bad Request
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  code:
+                    type: integer
+                    format: int32
+                    example: 400
+                  description:
+                    type: string
+                    example: Invalid product ID data type
+                  name:
+                    type: string
+                    example: Bad Request
         '404':
           description: Not Found
           content:
@@ -115,7 +132,7 @@ paths:
                     example: 404
                   description:
                     type: string
-                    example: Resource not found
+                    example: Product not found
                   name:
                     type: string
                     example: Not Found
diff --git a/contracts/products.spec b/contracts/products.spec
index 98f4858..dee7c37 100644
--- a/contracts/products.spec
+++ b/contracts/products.spec
@@ -3,6 +3,13 @@ Feature: Products API
   Background:
     Given openapi ./documentation.yaml
 
+  Scenario Outline: Get Product Success
+    When GET /v1/products/(id:number)
+    Then status 400
+    Examples:
+      | id  |
+      | 1.1 |
+
   Scenario Outline: Get Product Not Found Error
     When GET /v1/products/(id:number)
     Then status 404
@@ -16,6 +23,7 @@ Feature: Products API
     Examples:
       | id |
       | 1  |
+      | 4  |
 
   Scenario Outline: Products List Success
     When GET /v1/products
diff --git a/server.py b/server.py
index 5aa9518..1495a48 100644
--- a/server.py
+++ b/server.py
@@ -1,4 +1,5 @@
 from flask import abort, json, Flask
+from werkzeug.exceptions import HTTPException
 
 
 app = Flask(__name__)
@@ -9,7 +10,7 @@ def get_products_list():
         return json.loads(f.read())
 
 
-@app.errorhandler(404)
+@app.errorhandler(HTTPException)
 def resource_not_found(e):
     response = e.get_response()
     response.data = json.dumps({
@@ -32,8 +33,16 @@ def index():
     return response
 
 
-@app.route('/v1/products/<int:id>', methods=['GET'])
+@app.route('/v1/products/<id>', methods=['GET'])
 def get(id):
+    # This check is made on purpose to simulate 400 error
+    try:
+        if str(int(id)) != str(id):
+            raise ValueError()
+        id = int(id)
+    except ValueError:
+        abort(400, description='Invalid product ID data type')
+
     data = get_products_list()
     for product in data:
         if product['id'] == id:
@@ -44,4 +53,4 @@ def get(id):
             )
             return response
 
-    abort(404, description="Resource not found")
+    abort(404, description='Product not found')