diff --git a/app.py b/app.py
new file mode 100644
index 0000000..2eda104
--- /dev/null
+++ b/app.py
@@ -0,0 +1,160 @@
+from pygrocy import Grocy
+from pygrocy.data_models.generic import EntityType
+from flask import Flask, render_template, request, redirect
+from datetime import datetime
+from werkzeug.middleware.proxy_fix import ProxyFix
+
+from pprint import pprint
+
+#Global variables
+DEFAULT_AMOUNT = 1
+CASHBOX_USERID = 3
+
+error_messages = {
+    'item_not_found': 'Tenhle produkt nemůžeme najít ve skladu. Zkus to prosím znovu a pokud to nepůjde, řekni někomu z Trhliny.',
+    'item_not_available': 'Podle kompjůtru ne! Náš systém říká že tuhle věc nemáme na skladu. Asi chyba u nás...',
+    'user_not_found': 'Tenhle účet neexistuje nebo nemá povolený kredit. Můžeš věc naskenovat znovu a hodit prachy do kasičky',
+}
+
+
+
+g = Grocy("http://localhost", "BZzLkorATL66hSbKwIERoesALcIqNUPW91zONNNTHP0r9N6vk2", port=8080)
+
+
+# Write money movement into the ledger (transaction log in Grocy).
+def write_ledger(prod, userid, transaction_type, end_balance):
+    entity_id = { "userentity_id": 1 }
+    record_id = g.add_generic(EntityType.USER_OBJECTS, entity_id)['created_object_id']
+
+    account = userid
+    amount = prod['price']
+    balance = end_balance
+    item = prod['id']
+    time_grocy = g.get_system_time().time_local
+    time = time_grocy.strftime("%Y-%m-%d, %H:%M:%S")
+
+    g.set_userfields('userentity-accounting', record_id, 'account', account)
+    g.set_userfields('userentity-accounting', record_id, 'amount', amount)
+    g.set_userfields('userentity-accounting', record_id, 'balance', balance)
+    g.set_userfields('userentity-accounting', record_id, 'item', item)
+    g.set_userfields('userentity-accounting', record_id, 'type', transaction_type)
+    g.set_userfields('userentity-accounting', record_id, 'datetime', time)
+
+
+
+# Subtract the price from user account or add it to the cashier. Also write it to ledger.
+def prod_bill_user(prod, user):
+    start_balance = user['balance']
+    end_balance = start_balance - prod['price']
+    g.set_userfields('users', user['id'], 'balance', end_balance)
+    write_ledger(prod, user['id'], 'bar-bill-user', end_balance)
+    return(end_balance)
+
+# Add money paid for the product to the cashbox. 
+def prod_bill_cash(prod):
+    for user in g.users():
+        if user.id == CASHBOX_USERID:
+            cashbox = user
+            break
+
+    start_balance = float(g.get_userfields('users', cashbox.id)['balance'])
+    end_balance = start_balance + prod['price']
+    g.set_userfields('users', cashbox.id, 'balance', end_balance)
+    write_ledger(prod, 3, 'bar-cash-payment', end_balance)
+
+
+# Receive barcode and user code from website and process it.
+def prod_consume(prod):
+    g.consume_product(product_id = prod['id'], amount = DEFAULT_AMOUNT)
+
+# Find user by custom variable barid - code for credit payments
+def user_by_barid(user_barid):
+    users = g.users()
+    users_data = []
+    # Get all users and their custom fields
+    for user in users:
+        user_fields = g.get_userfields('users', user.id)
+        if user_fields['accountingenabled']:
+            user_data = {
+                'accounting_enabled': user_fields['accountingenabled'],
+                'balance': float(user_fields['balance']),
+                'barid': user_fields['barid'],
+                'name': user.display_name,
+                'id': user.id
+            }
+            users_data.append(user_data)
+            
+    # Find user with selected barID
+    for user in users_data:
+        if user['barid'] == str(user_barid):
+            return user
+
+    # If no user with this barID and enabled accounting is found, return false
+    return False
+
+
+# Get data about product and price by barcode
+def prod_by_barcode(barcode):
+    prod = g.product_by_barcode(barcode)
+    sell_price = g.get_userfields('products', prod.id)['sellprice']
+    prod_data = {
+        'id': prod.id,
+        'name': prod.name,
+        'available': prod.available_amount,
+        'price': float(sell_price),
+        'barcode': barcode
+    }
+    return prod_data
+
+
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/checkout/', methods=['POST'])
+def scan():
+    barcode = request.form.get('barcode')
+    try:
+        prod = prod_by_barcode(barcode)
+        
+    except:
+        return redirect('/error/item_not_found')
+    
+    if int(prod['available']) > 0:
+        return render_template('checkout.html', prod = prod)
+    else:
+        return redirect('/error/item_not_available')
+
+@app.route('/cash-payment/', methods=['POST'])
+def cash_payment():
+    barcode = request.form.get('barcode')
+    prod = prod_by_barcode(barcode)
+    prod_consume(prod)
+    prod_bill_cash(prod)
+    return render_template('cash-payment.html', prod = prod)
+
+@app.route('/account-payment/', methods=['POST'])
+def account_payment():
+    user_barid = request.form.get('barid')
+    barcode = request.form.get('barcode')
+    prod = prod_by_barcode(barcode)
+    user = user_by_barid(user_barid)
+    if user:
+        prod_consume(prod)
+        end_balance = prod_bill_user(prod, user)
+        return render_template('account-payment.html', prod = prod, user = user, balance = end_balance)
+    else:
+        return redirect('/error/user_not_found')
+    
+
+@app.route('/error/<err>')
+def error_send(err):
+    return render_template('error.html', msg = error_messages[err])
+
+
+if __name__ == '__main__':
+	app.run(host="0.0.0.0")
+	app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1)
\ No newline at end of file
diff --git a/app/app.py b/app/app.py
index deb2ad7..2eda104 100644
--- a/app/app.py
+++ b/app/app.py
@@ -2,6 +2,7 @@ from pygrocy import Grocy
 from pygrocy.data_models.generic import EntityType
 from flask import Flask, render_template, request, redirect
 from datetime import datetime
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 from pprint import pprint
 
@@ -155,4 +156,5 @@ def error_send(err):
 
 
 if __name__ == '__main__':
-	app.run(host="0.0.0.0")
\ No newline at end of file
+	app.run(host="0.0.0.0")
+	app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1)
\ No newline at end of file
diff --git a/app/requirements.txt b/requirements.txt
similarity index 100%
rename from app/requirements.txt
rename to requirements.txt
diff --git a/app/templates/account-payment.html b/templates/account-payment.html
similarity index 100%
rename from app/templates/account-payment.html
rename to templates/account-payment.html
diff --git a/app/templates/base.html b/templates/base.html
similarity index 100%
rename from app/templates/base.html
rename to templates/base.html
diff --git a/app/templates/cash-payment.html b/templates/cash-payment.html
similarity index 100%
rename from app/templates/cash-payment.html
rename to templates/cash-payment.html
diff --git a/app/templates/checkout.html b/templates/checkout.html
similarity index 100%
rename from app/templates/checkout.html
rename to templates/checkout.html
diff --git a/app/templates/error.html b/templates/error.html
similarity index 100%
rename from app/templates/error.html
rename to templates/error.html
diff --git a/app/templates/index.html b/templates/index.html
similarity index 100%
rename from app/templates/index.html
rename to templates/index.html