diff --git a/inema/inema.py b/inema/inema.py
index 8eb332e..e3d5527 100644
--- a/inema/inema.py
+++ b/inema/inema.py
@@ -1,9 +1,7 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 
-from datetime import datetime, date
-from pytz import timezone
-import hashlib
+from datetime import date
 import json
 from lxml import etree
 from zeep import Client
@@ -15,6 +13,8 @@ import io
 import logging
 import decimal
 
+from .utils import compute_1c4a_hash, gen_timestamp
+
 __version__ = pkg_resources.get_distribution(__package__).version
 
 _logger = logging.getLogger(__name__)
@@ -61,25 +61,6 @@ class Internetmarke(object):
 
     # generate a 1C4A SOAP header
     def gen_1c4a_hdr(self, partner_id, key_phase, key):
-        # Compute 1C4A request hash accordig to Section 4 of service description
-        def compute_1c4a_hash(partner_id, req_ts, key_phase, key):
-            # trim leading and trailing spaces of each argument
-            partner_id = partner_id.strip()
-            req_ts = req_ts.strip()
-            key_phase = key_phase.strip()
-            key = key.strip()
-            # concatenate with "::" separator
-            inp = "%s::%s::%s::%s" % (partner_id, req_ts, key_phase, key)
-            # compute MD5 hash as 32 hex nibbles
-            md5_hex = hashlib.md5(inp.encode('utf8')).hexdigest()
-            # return the first 8 characters
-            return md5_hex[:8]
-
-        def gen_timestamp():
-            de_zone = timezone("Europe/Berlin")
-            de_time = datetime.now(de_zone)
-            return de_time.strftime("%d%m%Y-%H%M%S")
-
         nsmap={'soapenv': 'http://schemas.xmlsoap.org/soap/envelope/',
                'v3':'http://oneclickforpartner.dpag.de'}
         r = etree.Element("{http://schemas.xmlsoap.org/soap/envelope/}Header", nsmap = nsmap)
diff --git a/inema/utils.py b/inema/utils.py
new file mode 100644
index 0000000..e932e67
--- /dev/null
+++ b/inema/utils.py
@@ -0,0 +1,24 @@
+
+import hashlib
+from datetime import datetime
+from pytz import timezone
+
+def compute_1c4a_hash(partner_id, req_ts, key_phase, key):
+    """Compute 1C4A request hash according to Section 4 of service description."""
+    # trim leading and trailing spaces of each argument
+    partner_id = partner_id.strip()
+    req_ts = req_ts.strip()
+    key_phase = key_phase.strip()
+    key = key.strip()
+    # concatenate with "::" separator
+    inp = "%s::%s::%s::%s" % (partner_id, req_ts, key_phase, key)
+    # compute MD5 hash as 32 hex nibbles
+    md5_hex = hashlib.md5(inp.encode('utf8')).hexdigest()
+    # return the first 8 characters
+    return md5_hex[:8]
+
+def gen_timestamp():
+    """Compute a timestamp as used in the 1C4A and WaPoInt APIs."""
+    de_zone = timezone("Europe/Berlin")
+    de_time = datetime.now(de_zone)
+    return de_time.strftime("%d%m%Y-%H%M%S")
diff --git a/inema/wpint.py b/inema/wpint.py
index 95b4eee..9cfef27 100644
--- a/inema/wpint.py
+++ b/inema/wpint.py
@@ -11,12 +11,11 @@
 
 import json
 import logging
-import hashlib
-from datetime import datetime
 
 import requests
 from lxml import etree
-from pytz import timezone
+
+from .utils import compute_1c4a_hash, gen_timestamp
 
 _logger = logging.getLogger(__name__)
 
@@ -39,30 +38,6 @@ class WarenpostInt(object):
         self.user_token = None
         self.wallet_balance = None
 
-    # FIXME: merge with inema?
-    @staticmethod
-    def compute_1c4a_hash(partner_id, req_ts, key_phase, key):
-        """ Compute 1C4A request hash accordig to Section 4 of service description. """
-        # trim leading and trailing spaces of each argument
-        partner_id = partner_id.strip()
-        req_ts = req_ts.strip()
-        key_phase = key_phase.strip()
-        key = key.strip()
-        # concatenate with "::" separator
-        inp = "%s::%s::%s::%s" % (partner_id, req_ts, key_phase, key)
-        # compute MD5 hash as 32 hex nibbles
-        md5_hex = hashlib.md5(inp.encode('utf8')).hexdigest()
-        # return the first 8 characters
-        return md5_hex[:8]
-
-    # FIXME: merge with inema?
-    @staticmethod
-    def gen_timestamp():
-        """Generate a timestamp as used in the Warenpsost International API."""
-        de_zone = timezone("Europe/Berlin")
-        de_time = datetime.now(de_zone)
-        return de_time.strftime("%d%m%Y-%H%M%S")
-
     def gen_headers(self):
         """Generate the HTTP headers required for the API."""
         ret = {
@@ -74,8 +49,8 @@ class WarenpostInt(object):
             ret['REQUEST_TIMESTAMP'] = '16082018-122210'
             ret['PARTNER_SIGNATURE'] = '9d7c35be'
         else:
-            timestamp = self.gen_timestamp()
-            sig = self.compute_1c4a_hash(self.partner_id, timestamp, self.key_phase, self.key)
+            timestamp = gen_timestamp()
+            sig = compute_1c4a_hash(self.partner_id, timestamp, self.key_phase, self.key)
             ret['REQUEST_TIMESTAMP'] = timestamp
             ret['PARTNER_SIGNATURE'] = sig
         return ret