diff --git a/src/openforms/registrations/contrib/camunda/apps.py b/src/openforms/registrations/contrib/camunda/apps.py
index 909500d1d6..3fb40ee800 100644
--- a/src/openforms/registrations/contrib/camunda/apps.py
+++ b/src/openforms/registrations/contrib/camunda/apps.py
@@ -1,6 +1,10 @@
+from decimal import Decimal
+
 from django.apps import AppConfig
 from django.utils.translation import gettext_lazy as _
 
+from django_camunda.utils import TYPE_MAP as CAMUNDA_TYPE_MAP
+
 
 class CamundaApp(AppConfig):
     name = "openforms.registrations.contrib.camunda"
@@ -8,5 +12,11 @@ class CamundaApp(AppConfig):
     verbose_name = _("Camunda registration plugin")
 
     def ready(self):
+        patch_django_camunda()
+
         # register plugin
         from . import plugin  # noqa
+
+
+def patch_django_camunda():
+    CAMUNDA_TYPE_MAP[Decimal] = ("Double", lambda val: str(val))
diff --git a/src/openforms/registrations/contrib/camunda/plugin.py b/src/openforms/registrations/contrib/camunda/plugin.py
index 2e235b3c2b..b5adc6d02d 100644
--- a/src/openforms/registrations/contrib/camunda/plugin.py
+++ b/src/openforms/registrations/contrib/camunda/plugin.py
@@ -47,7 +47,7 @@ def get_process_variables(
     # dict of {componentKey: camundaProcesVar} mapping
     simple_mappings = dict(
         [
-            (key := process_var["componentKey"], process_var.get("alias") or key)
+            (key := process_var["component_key"], process_var.get("alias") or key)
             for process_var in process_variables
             if process_var.get("enabled")
         ]
diff --git a/src/openforms/registrations/contrib/camunda/tests/test_backend.py b/src/openforms/registrations/contrib/camunda/tests/test_backend.py
index 6e003514a3..ee2d1872eb 100644
--- a/src/openforms/registrations/contrib/camunda/tests/test_backend.py
+++ b/src/openforms/registrations/contrib/camunda/tests/test_backend.py
@@ -1,4 +1,5 @@
 import uuid
+from decimal import Decimal
 from unittest.mock import patch
 
 from django.test import TestCase
@@ -276,12 +277,12 @@ def test_submission_with_mapped_variables(self, m, mock_start_process):
             "process_variables": [
                 {
                     "enabled": True,
-                    "componentKey": "currency",
+                    "component_key": "currency",
                     "alias": "amount",
                 },
                 {
                     "enabled": True,
-                    "componentKey": "invoiceCategory",
+                    "component_key": "invoiceCategory",
                     "alias": "",
                 },
             ],
@@ -294,7 +295,7 @@ def test_submission_with_mapped_variables(self, m, mock_start_process):
             process_key="invoice",
             variables=serialize_variables(
                 {
-                    "amount": "25.00",
+                    "amount": Decimal("25.00"),
                     "invoiceCategory": "Misc",
                 }
             ),
diff --git a/src/openforms/registrations/contrib/camunda/type_mapping.py b/src/openforms/registrations/contrib/camunda/type_mapping.py
index d183b9d0bb..37db81a95c 100644
--- a/src/openforms/registrations/contrib/camunda/type_mapping.py
+++ b/src/openforms/registrations/contrib/camunda/type_mapping.py
@@ -6,6 +6,7 @@
 
 The work in #1068 should eventually make this module obsolete.
 """
+from decimal import Decimal
 from typing import Any, Dict, List
 
 from dateutil import parser
@@ -60,6 +61,7 @@ def selectboxes(component, value) -> List[str]:
     "map": noop,  # list of coordinates (lng, lat) in float format
     "password": to_str,
     "licenseplate": to_str,
+    "currency": lambda c, value: Decimal(str(value)),
 }