diff --git a/src/openforms/registrations/contrib/json/plugin.py b/src/openforms/registrations/contrib/json/plugin.py
index 2474fe1a01..0cd7b55278 100644
--- a/src/openforms/registrations/contrib/json/plugin.py
+++ b/src/openforms/registrations/contrib/json/plugin.py
@@ -1,18 +1,37 @@
 from django.utils.translation import gettext_lazy as _
 
 from openforms.submissions.models import Submission
+from openforms.variables.service import get_static_variables
+
 from ...base import BasePlugin, OptionsT  # openforms.registrations.base
 from ...registry import register  # openforms.registrations.registry
 from .config import JSONOptionsSerializer
 
 
 @register("json")
-class JSONPlugin(BasePlugin):
+class JSONRegistration(BasePlugin):
     verbose_name = _("JSON registration")
     configuration_options = JSONOptionsSerializer
 
     def register_submission(self, submission: Submission, options: OptionsT) -> None:
-        print(options)
+        static_variables = get_static_variables(submission=submission)
+        static_variables_dict = {
+            variable.key: variable.initial_value for variable in static_variables
+        }
+
+        # TODO-4908: what should the behaviour be when a form
+        #  variable is not in the data or static variables?
+        values = {
+            form_variable: submission.data.get(
+                form_variable, static_variables_dict.get(form_variable)
+            )
+            for form_variable in options["form_variables"]
+        }
+
+        print(values)
+
+        # TODO-4908: send `values` to some service
+        data_to_be_sent = {"values": values}
 
     def check_config(self):
         pass