diff --git a/app.py b/app.py
index 2eda104..8c3fff8 100644
--- a/app.py
+++ b/app.py
@@ -3,12 +3,13 @@ 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
+import os
 
 from pprint import pprint
 
-#Global variables
+#Default global variables
 DEFAULT_AMOUNT = 1
-CASHBOX_USERID = 3
+CASHBOX_USERID = 1
 
 error_messages = {
     'item_not_found': 'Tenhle produkt nemůžeme najít ve skladu. Zkus to prosím znovu a pokud to nepůjde, řekni někomu z Trhliny.',
@@ -16,9 +17,13 @@ error_messages = {
     'user_not_found': 'Tenhle účet neexistuje nebo nemá povolený kredit. Můžeš věc naskenovat znovu a hodit prachy do kasičky',
 }
 
+GROCY_URL = os.getenv('GROCY_URL')
+GROCY_API_KEY = os.getenv('GROCY_API_KEY')
+GROCY_PORT = os.getenv('GROCY_PORT')
+CASHBOX_USERID = os.getenv('CASHBOX_USER_ID')
 
 
-g = Grocy("http://localhost", "BZzLkorATL66hSbKwIERoesALcIqNUPW91zONNNTHP0r9N6vk2", port=8080)
+g = Grocy(GROCY_URL, GROCY_API_KEY, port=GROCY_PORT)
 
 
 # Write money movement into the ledger (transaction log in Grocy).
diff --git a/sample-config.env b/sample-config.env
new file mode 100644
index 0000000..59aa38e
--- /dev/null
+++ b/sample-config.env
@@ -0,0 +1,4 @@
+GROCY_URL=https://en.demo.grocy.info
+GROCY_API_KEY=xxxxx
+GROCY_PORT=443
+CASHBOX_USER_ID=2
\ No newline at end of file