diff --git a/requirements.txt b/requirements.txt
index 757931f..bfe4f57 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
 tornado==6.0.4
 isodate==0.6.0
 pytest==5.4.1
+schwifty==2020.11.0
+Cerberus==1.3.2
\ No newline at end of file
diff --git a/test_cerberus.py b/test_cerberus.py
new file mode 100644
index 0000000..e81e7e6
--- /dev/null
+++ b/test_cerberus.py
@@ -0,0 +1,76 @@
+#!/usr/bin/python3
+
+import cerberus
+from schwifty import IBAN, BIC
+import datetime
+
+def valid_iban(field, value, error):
+    try:
+        IBAN(value)
+        return True
+    except ValueError:
+        error(field, 'not a valid IBAN')
+
+def valid_bic(field, value, error):
+    try:
+        BIC(value)
+        return True
+    except ValueError:
+        error(field, 'not a valid BIC')
+
+def iso_date(field, value, error):
+    try:
+        datetime.datetime.strptime(value, "%Y-%m-%d")
+        return True
+    except ValueError:
+        error(field, 'not a valid IDO 8601 date')
+
+document = {
+            'finanzdaten': 
+                {
+                'bic': 'PBNKDEFFXXX', 
+                'holder': '', 
+                'iban': 'DE89370400440532013000', 
+                'issuance': '2012-01-01', 
+                'reference': '0042', 
+                'scan-sepa-mandate': ''
+                }, 
+            'mitgliederdaten': 
+                {
+                'bis': '', 
+                'mitgliedsbeitrag': '30', 
+                'scan-antrag': '', 
+                'schliessberechtigung': 'Ja', 
+                'spendenbeitrag': '', 
+                'status': 'V', 
+                'von': '2012-01-01'
+                }, 
+            'stammdaten': 
+                {
+                'address_code': '39104', 
+                'address_country': 'DE', 
+                'address_label': 'Max Hackerberg\nLeibnizstr. 32\n39104 Magdeburg', 
+                'address_locality': 'Magdeburg', 
+                'address_region': '', 
+                'address_street': 'Leibnizstr. 32', 
+                'birth_date': '1970-01-01', 
+                'birth_location': 'Hackstadt', 
+                'email': 'max.hackerberg@netz39.de', 
+                'fullname': 'Max Hackerberg', 
+                'nickname': 'maxH', 
+                'pgp-key': '', 
+                'ssh-key': ''
+                }, 
+            'timestamp': '2020-03-25T23:58:11', 
+            'id': '6af68'
+            }
+
+schema_fin={'bic': {'type': 'string', 'check_with': valid_bic},
+            'iban': {'type': 'string', 'check_with': valid_iban},
+            'issuance': {'type': 'string', 'check_with': iso_date},
+            'reference': {'type': 'string'},
+            'scan-sepa-mandate': {'type': 'string'},
+            'holder': {'type': 'string'}}
+
+v = cerberus.Validator()
+v.validate(document['finanzdaten'], schema_fin)
\ No newline at end of file