diff --git a/src/Pipfile b/src/Pipfile
index fb832c8..70abf3b 100644
--- a/src/Pipfile
+++ b/src/Pipfile
@@ -12,6 +12,8 @@ pymysql = "*"
 flask-praetorian = "*"
 flask-sqlalchemy = "*"
 flask-migrate = "*"
+flask-marshmallow = "*"
+marshmallow = "*"
 
 [requires]
 python_version = "3.8"
diff --git a/src/Pipfile.lock b/src/Pipfile.lock
index 6288644..72c6323 100644
--- a/src/Pipfile.lock
+++ b/src/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "4328be3ab2dfc7cdc0c6dfc8ff03702be800ff524133228b149ca368e1d29bfe"
+            "sha256": "f45ecdf6d0ebe7b78d400e7fc1df90d2dbabf6e9f1c146e4768f215652c06008"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -30,10 +30,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
-                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
+                "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304",
+                "sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519"
             ],
-            "version": "==2019.11.28"
+            "version": "==2020.4.5.1"
         },
         "chardet": {
             "hashes": [
@@ -51,11 +51,11 @@
         },
         "flask": {
             "hashes": [
-                "sha256:13f9f196f330c7c2c5d7a5cf91af894110ca0215ac051b5844701f2bfd934d52",
-                "sha256:45eb5a6fd193d6cf7e0cf5d8a5b31f83d5faae0293695626f539a823e93b13f6"
+                "sha256:4efa1ae2d7c9865af48986de8aeb8504bf32c7f3d6fdc9353d34b21f4b127060",
+                "sha256:8a4fdd8936eba2512e9c85df320a37e694c93945b33ef33c89946a340a238557"
             ],
             "index": "pypi",
-            "version": "==1.1.1"
+            "version": "==1.1.2"
         },
         "flask-buzz": {
             "hashes": [
@@ -70,6 +70,14 @@
             ],
             "version": "==0.9.1"
         },
+        "flask-marshmallow": {
+            "hashes": [
+                "sha256:01520ef1851ccb64d4ffb33196cddff895cc1302ae1585bff1abf58684a8111a",
+                "sha256:28b969193958d9602ab5d6add6d280e0e360c8e373d3492c2f73b024ecd36374"
+            ],
+            "index": "pypi",
+            "version": "==0.11.0"
+        },
         "flask-migrate": {
             "hashes": [
                 "sha256:4dc4a5cce8cbbb06b8dc963fd86cf8136bd7d875aabe2d840302ea739b243732",
@@ -160,6 +168,14 @@
             ],
             "version": "==1.1.1"
         },
+        "marshmallow": {
+            "hashes": [
+                "sha256:90854221bbb1498d003a0c3cc9d8390259137551917961c8b5258c64026b2f85",
+                "sha256:ac2e13b30165501b7d41fc0371b8df35944f5849769d136f20e2c5f6cdc6e665"
+            ],
+            "index": "pypi",
+            "version": "==3.5.1"
+        },
         "passlib": {
             "hashes": [
                 "sha256:68c35c98a7968850e17f1b6892720764cc7eed0ef2b7cb3116a89a28e43fe177",
@@ -258,16 +274,16 @@
         },
         "sqlalchemy": {
             "hashes": [
-                "sha256:c4cca4aed606297afbe90d4306b49ad3a4cd36feb3f87e4bfd655c57fd9ef445"
+                "sha256:7224e126c00b8178dfd227bc337ba5e754b197a3867d33b9f30dc0208f773d70"
             ],
-            "version": "==1.3.15"
+            "version": "==1.3.16"
         },
         "twilio": {
             "hashes": [
-                "sha256:284040aa4cd504d67e95cde17db38d4d11454ac8bd43cab94f66694241b962af"
+                "sha256:39b949c671f1b29259c85569de58e6a4c8b04e13aba08d2d20ddba9d7c304573"
             ],
             "index": "pypi",
-            "version": "==6.37.0"
+            "version": "==6.38.0"
         },
         "urllib3": {
             "hashes": [
@@ -278,10 +294,10 @@
         },
         "werkzeug": {
             "hashes": [
-                "sha256:169ba8a33788476292d04186ab33b01d6add475033dfc07215e6d219cc077096",
-                "sha256:6dc65cf9091cf750012f56f2cad759fa9e879f511b5ff8685e456b4e3bf90d16"
+                "sha256:2de2a5db0baeae7b2d2664949077c2ac63fbd16d98da0ff71837f7d1dea3fd43",
+                "sha256:6c80b1e5ad3665290ea39320b91e1be1e0d5f60652b964a3070216de83d2e47c"
             ],
-            "version": "==1.0.0"
+            "version": "==1.0.1"
         }
     },
     "develop": {}
diff --git a/src/app/__init__.py b/src/app/__init__.py
index 59127e7..0f8819b 100644
--- a/src/app/__init__.py
+++ b/src/app/__init__.py
@@ -2,10 +2,12 @@ from flask import Flask
 from config import Config
 from flask_sqlalchemy import SQLAlchemy
 from flask_migrate import Migrate
+from flask_marshmallow import Marshmallow
 
 app = Flask(__name__)
 app.config.from_object(Config)
 db = SQLAlchemy(app)
 migrate = Migrate(app, db)
+ma = Marshmallow(app)
 
 from app import routes, models
diff --git a/src/app/routes.py b/src/app/routes.py
index 0ab9232..bff5ac1 100644
--- a/src/app/routes.py
+++ b/src/app/routes.py
@@ -1,12 +1,12 @@
 from flask import request, jsonify
-from database import register_user
+from database.crud import insert_data
 from external.twilio import send_otp
 from app import app
 
 
-@app.route("/users", methods=["POST"])
+@app.route("/register", methods=["POST"])
 def create_user():
     data = request.get_json()
-    register_user(data)
-    send_otp(data["mobile"])
+    insert_data(schema="Users", data=data)
+    send_otp(receiver=data["mobile"])
     return jsonify("User created, pending OTP verification")
diff --git a/src/database/crud.py b/src/database/crud.py
new file mode 100644
index 0000000..9d7b86a
--- /dev/null
+++ b/src/database/crud.py
@@ -0,0 +1,30 @@
+from app import db
+from database.models import *
+from database.schema import *
+from marshmallow import ValidationError
+
+
+def insert_data(schema, data):
+    instance = validate_data(schema=schema, data=data)
+    db.session.add(instance)
+    db.session.commit()
+
+
+def delete_data(id):
+    db.session.delete(data)
+    db.session.commit()
+
+
+def update_otp(user_id, otp):
+    db.session.query(table="Users").filter_by(id=user_id).update(dict(otp=otp))
+    db.session.commit()
+
+
+def validate_data(schema, data):
+    validation_schema = schema + "Schema()"
+    instance = validation_schema
+    try:
+        output = instance.load(data).data
+        return output
+    except ValidationError as err:
+        print(err.messages)
diff --git a/src/database/models.py b/src/database/models.py
index 9d069bd..ebf2e2c 100644
--- a/src/database/models.py
+++ b/src/database/models.py
@@ -26,7 +26,6 @@ class Users(db.Model):
 
     def __init__(
         self,
-        id,
         social_id,
         type,
         full_name,
@@ -46,9 +45,7 @@ class Users(db.Model):
         admin_status,
         device_id,
         device_type,
-        created,
     ):
-        self.id = id
         self.social_id = social_id
         self.type = type
         self.full_name = full_name
@@ -68,7 +65,6 @@ class Users(db.Model):
         self.admin_status = admin_status
         self.device_id = device_id
         self.device_type = device_type
-        self.created = created
 
 
 class Cities(db.Model):
@@ -116,7 +112,6 @@ class Games(db.Model):
 
     def __init__(
         self,
-        id,
         name,
         image,
         date_time,
@@ -133,10 +128,7 @@ class Games(db.Model):
         no_of_already_player,
         payment_mode,
         card_id,
-        created,
-        updated,
     ):
-        self.id = id
         self.name = name
         self.image = image
         self.date_time = date_time
@@ -151,8 +143,6 @@ class Games(db.Model):
         self.no_of_already_player = no_of_already_player
         self.payment_mode = payment_mode
         self.card_id = card_id
-        self.created = created
-        self.updated = updated
 
 
 class Payments(db.Model):
@@ -173,7 +163,6 @@ class Payments(db.Model):
 
     def __init__(
         self,
-        id,
         user_id,
         game_id,
         amount,
@@ -185,10 +174,7 @@ class Payments(db.Model):
         description,
         pay_mode,
         status,
-        created,
-        modified,
     ):
-        self.id = id
         self.user_id = user_id
         self.game_id = game_id
         self.amount = amount
@@ -200,11 +186,9 @@ class Payments(db.Model):
         self.description = description
         self.pay_mode = pay_mode
         self.status = status
-        self.created = created
-        self.modified = modified
 
 
-class Player_Availabilities:
+class PlayerAvailabilities:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     game_id = db.Column(db.Integer)
     player_id = db.Column(db.Integer)
@@ -213,17 +197,14 @@ class Player_Availabilities:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, game_id, player_id, status, created, modified,
+        self, game_id, player_id, status,
     ):
-        self.id = id
         self.game_id = game_id
         self.player_id = player_id
         self.status = status
-        self.created = created
-        self.modified = modified
 
 
-class Player_Cancel_Games:
+class PlayerCancelGames:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     player_id = db.Column(db.Integer)
     game_id = db.Column(db.Integer)
@@ -231,16 +212,13 @@ class Player_Cancel_Games:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, player_id, game_id, created, modified,
+        self, player_id, game_id,
     ):
-        self.id = id
         self.player_id = player_id
         self.game_id = game_id
-        self.created = created
-        self.modified = modified
 
 
-class Purchase_Games:
+class PurchaseGames:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     game_id = db.Column(db.Integer)
     user_id = db.Column(db.Integer)
@@ -249,14 +227,11 @@ class Purchase_Games:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, game_id, user_id, pay_mode, created, modified,
+        self, game_id, user_id, pay_mode,
     ):
-        self.id = id
         self.game_id = game_id
         self.user_id = user_id
         self.pay_mode = pay_mode
-        self.created = created
-        self.modified = modified
 
 
 class Sports:
@@ -268,14 +243,11 @@ class Sports:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, name, spanish_name, status, created, modified,
+        self, name, spanish_name, status,
     ):
-        self.id = id
         self.name = name
         self.spanish_name = spanish_name
         self.status = status
-        self.created = created
-        self.modified = modified
 
 
 class Teams:
@@ -288,18 +260,15 @@ class Teams:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, game_id, user_id, team_id, status, created, modified,
+        self, game_id, user_id, team_id, status,
     ):
-        self.id = id
         self.game_id = game_id
         self.user_id = user_id
         self.team_id = team_id
         self.status = status
-        self.created = created
-        self.modified = modified
 
 
-class User_Ratings:
+class UserRatings:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     game_id = db.Column(db.Integer)
     user_id = db.Column(db.Integer)
@@ -309,20 +278,15 @@ class User_Ratings:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
     user_type = db.Column(db.Integer)
 
-    def __init__(
-        self, id, game_id, user_id, player_id, rating, created, modified, user_type
-    ):
-        self.id = id
+    def __init__(self, game_id, user_id, player_id, rating, user_type):
         self.game_id = game_id
         self.user_id = user_id
         self.player_id = player_id
         self.rating = rating
-        self.created = created
-        self.modified = modified
         self.user_type = user_type
 
 
-class Venue_Images:
+class VenueImages:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     venue_id = db.Column(db.Integer)
     user_id = db.Column(db.Integer)
@@ -331,14 +295,11 @@ class Venue_Images:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, venue_id, user_id, image, created, modified,
+        self, venue_id, user_id, image,
     ):
-        self.id = id
         self.venue_id = venue_id
         self.user_id = user_id
         self.image = image
-        self.created = created
-        self.modified = modified
 
 
 class Venues:
@@ -353,29 +314,17 @@ class Venues:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self,
-        id,
-        user_id,
-        address,
-        latitude,
-        longitude,
-        name,
-        sports_id,
-        created,
-        modified,
+        self, user_id, address, latitude, longitude, name, sports_id,
     ):
-        self.id = id
         self.user_id = user_id
         self.address = address
         self.latitude = latitude
         self.longitude = longitude
         self.name = name
         self.sports_id = sports_id
-        self.created = created
-        self.modified = modified
 
 
-class View_News:
+class ViewNews:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     news_id = db.Column(db.Integer)
     user_id = db.Column(db.Integer)
@@ -383,16 +332,13 @@ class View_News:
     modified = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self, id, news_id, user_id, created, modified,
+        self, news_id, user_id,
     ):
-        self.id = id
         self.news_id = news_id
         self.user_id = user_id
-        self.created = created
-        self.modified = modified
 
 
-class Web_Bookings:
+class WebBookings:
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     name = db.Column(db.String(255))
     email = db.Column(db.String(255))
@@ -404,20 +350,8 @@ class Web_Bookings:
     updated = db.Column(db.DateTime, nullable=False, onupdate=db.func.now())
 
     def __init__(
-        self,
-        id,
-        user_id,
-        address,
-        name,
-        email,
-        contact,
-        message,
-        game,
-        city,
-        created,
-        updated,
+        self, user_id, address, name, email, contact, message, game, city,
     ):
-        self.id = id
         self.user_id = user_id
         self.address = address
         self.name = name
@@ -426,5 +360,3 @@ class Web_Bookings:
         self.message = message
         self.game = game
         self.city = city
-        self.created = created
-        self.updated = updated
diff --git a/src/database/schema.py b/src/database/schema.py
new file mode 100644
index 0000000..94d904e
--- /dev/null
+++ b/src/database/schema.py
@@ -0,0 +1,92 @@
+from app import ma
+from database.models import *
+from marshmallow.validate import Length, Range
+
+
+class UsersSchema(ma.Schema):
+    full_name = ma.fields.Str(required=True, validate=Length(max=255))
+    email = ma.fields.Email(required=True, validate=Length(max=255))
+    password = ma.fields.Str(validate=Length(max=255))
+    gender = ma.fields.Integer(required=True, validate=Range(min=1, max=2))
+    mobile = ma.fields.Str(required=True, validate=Length(max=13))
+    user_image = ma.fields.Str(validate=Length(max=255))
+    user_type = ma.fields.Integer(required=True, validate=Range(min=1, max=2))
+    lang_type = ma.fields.Integer(required=True, validate=Range(min=1, max=2))
+    device_type = ma.fields.Integer(required=True, validate=Range(min=1, max=2))
+    device_id = ma.fields.Str(required=True)
+
+    class Meta:
+        model = Users
+        include_fk = True
+
+
+class CitiesSchema(ma.Schema):
+    class Meta:
+        model = Cities
+        include_fk = True
+
+
+class GamesSchema(ma.Schema):
+    class Meta:
+        model = Games
+        include_fk = True
+
+
+class PlayerAvailabilitiesSchema(ma.Schema):
+    class Meta:
+        model = PlayerAvailabilities
+        include_fk = True
+
+
+class PlayerCancelGamesSchema(ma.Schema):
+    class Meta:
+        model = PlayerCancelGames
+        include_fk = True
+
+
+class PurchaseGamesSchema(ma.Schema):
+    class Meta:
+        model = PurchaseGames
+        include_fk = True
+
+
+class SportsSchema(ma.Schema):
+    class Meta:
+        model = Sports
+        include_fk = True
+
+
+class TeamsSchema(ma.Schema):
+    class Meta:
+        model = Teams
+        include_fk = True
+
+
+class UserRatingsSchema(ma.Schema):
+    class Meta:
+        model = UserRatings
+        include_fk = True
+
+
+class VenueImagesSchema(ma.Schema):
+    class Meta:
+        model = VenueImages
+        include_fk = True
+
+
+class VenuesSchema(ma.Schema):
+    class Meta:
+        model = Venues
+        include_fk = True
+
+
+class ViewNewsSchema(ma.Schema):
+    class Meta:
+        model = ViewNews
+        include_fk = True
+
+
+class WebBookingsSchema(ma.Schema):
+    class Meta:
+        model = WebBookings
+        include_fk = True