diff --git a/src/openforms/conf/base.py b/src/openforms/conf/base.py
index cb0aebf0d1..67665c1cea 100644
--- a/src/openforms/conf/base.py
+++ b/src/openforms/conf/base.py
@@ -224,6 +224,7 @@
     "openforms.registrations.contrib.objects_api",
     "openforms.registrations.contrib.microsoft_graph.apps.MicrosoftGraphApp",
     "openforms.registrations.contrib.camunda.apps.CamundaApp",
+    "openforms.registrations.contrib.new_plugin",
     "openforms.prefill",
     "openforms.prefill.contrib.demo.apps.DemoApp",
     "openforms.prefill.contrib.kvk.apps.KVKPrefillApp",
diff --git a/src/openforms/js/components/admin/form_design/RegistrationFields.stories.js b/src/openforms/js/components/admin/form_design/RegistrationFields.stories.js
index a35a3378e5..986af24c15 100644
--- a/src/openforms/js/components/admin/form_design/RegistrationFields.stories.js
+++ b/src/openforms/js/components/admin/form_design/RegistrationFields.stories.js
@@ -390,6 +390,21 @@ export default {
           type: 'object',
         },
       },
+      {
+        id: 'json',
+        label: 'JSON',
+        schema: {
+          properties: {
+            // TODO-4098: add actual relevant properties
+            extraLine: {
+              minLength: 1,
+              title: 'Extra print statement',
+              type: 'string',
+            },
+          },
+          type: 'object',
+        },
+      },
     ],
     configuredBackends: [],
     onChange: fn(),
@@ -663,6 +678,12 @@ export const ConfiguredBackends = {
           ],
         },
       },
+      {
+        key: 'backend11',
+        name: 'JSON',
+        backend: 'json',
+        options: {extraLine: 'We are checking.'},
+      },
     ],
     validationErrors: [
       ['form.registrationBackends.1.options.zgwApiGroup', 'You sure about this?'],
@@ -910,3 +931,25 @@ export const STUFZDS = {
     await userEvent.click(canvas.getByRole('button', {name: 'Opties instellen'}));
   },
 };
+
+
+export const JSON = {
+  args: {
+    configuredBackends: [
+      {
+        key: 'backend11',
+        name: 'JSON',
+        backend: 'json',
+        options: {
+          extraLine: 'We are checking.',
+        },
+      },
+    ],
+  },
+
+  play: async ({canvasElement}) => {
+    const canvas = within(canvasElement);
+
+    await userEvent.click(canvas.getByRole('button', {name: 'Opties instellen'}));
+  },
+};
diff --git a/src/openforms/js/components/admin/form_design/registrations/index.js b/src/openforms/js/components/admin/form_design/registrations/index.js
index c5de3f8053..4c549674ee 100644
--- a/src/openforms/js/components/admin/form_design/registrations/index.js
+++ b/src/openforms/js/components/admin/form_design/registrations/index.js
@@ -1,6 +1,7 @@
 import CamundaOptionsForm from './camunda';
 import DemoOptionsForm from './demo';
 import EmailOptionsForm from './email';
+import JSONOptionsForm from './json';
 import MSGraphOptionsForm from './ms_graph';
 import ObjectsApiOptionsForm from './objectsapi/ObjectsApiOptionsForm';
 import ObjectsApiSummaryHandler from './objectsapi/ObjectsApiSummaryHandler';
@@ -46,6 +47,7 @@ export const BACKEND_OPTIONS_FORMS = {
     form: StufZDSOptionsForm,
   },
   'microsoft-graph': {form: MSGraphOptionsForm},
+  'json': {form: JSONOptionsForm},
   // demo plugins
   demo: {form: DemoOptionsForm},
   'failing-demo': {form: DemoOptionsForm},
diff --git a/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js b/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js
new file mode 100644
index 0000000000..1dde8ff9f0
--- /dev/null
+++ b/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js
@@ -0,0 +1,74 @@
+import {useField} from 'formik';
+import PropTypes from 'prop-types';
+import React, {useContext} from 'react';
+import {FormattedMessage} from 'react-intl';
+
+import Field from 'components/admin/forms/Field';
+import Fieldset from 'components/admin/forms/Fieldset';
+import FormRow from 'components/admin/forms/FormRow';
+import {TextInput} from 'components/admin/forms/Inputs';
+import ModalOptionsConfiguration from 'components/admin/forms/ModalOptionsConfiguration';
+import {
+  ValidationErrorContext,
+  ValidationErrorsProvider,
+  filterErrors,
+} from 'components/admin/forms/ValidationErrors';
+
+
+const ExtraLine = () => {
+  const [fieldProps] = useField('extraLine');
+  return (
+    <FormRow>
+      <Field
+        name="extraLine"
+        label={
+          <FormattedMessage
+            description="Demo registration options 'extraLine' label"
+            defaultMessage="Extra print statement"
+          />
+        }
+      >
+        <TextInput id="id_extraLine" {...fieldProps} />
+      </Field>
+    </FormRow>
+  );
+};
+
+
+const JSONOptionsForm = ({name, label, formData, onChange}) => {
+  const validationErrors = useContext(ValidationErrorContext);
+  const relevantErrors = filterErrors(name, validationErrors);
+  return (
+    <ModalOptionsConfiguration
+      name={name}
+      label={label}
+      numErrors={relevantErrors.length}
+      modalTitle={
+        <FormattedMessage
+          description="JSON registration options modal title"
+          defaultMessage="Plugin configuration: JSON"
+        />
+      }
+      initialFormData={{extraLine: '', ...formData}}
+      onSubmit={values => onChange({formData: values})}
+      modalSize="small"
+    >
+      <ValidationErrorsProvider errors={relevantErrors}>
+        <Fieldset>
+          <ExtraLine />
+        </Fieldset>
+      </ValidationErrorsProvider>
+    </ModalOptionsConfiguration>
+  );
+};
+
+JSONOptionsForm.propTypes = {
+  name: PropTypes.string.isRequired,
+  label: PropTypes.node.isRequired,
+  formData: PropTypes.shape({
+    extraLine: PropTypes.string,
+  }),
+  onChange: PropTypes.func.isRequired,
+};
+
+export default JSONOptionsForm;
diff --git a/src/openforms/js/components/admin/form_design/registrations/json/index.js b/src/openforms/js/components/admin/form_design/registrations/json/index.js
new file mode 100644
index 0000000000..97a74031a6
--- /dev/null
+++ b/src/openforms/js/components/admin/form_design/registrations/json/index.js
@@ -0,0 +1,3 @@
+import JSONOptionsForm from './JSONOptionsForm';
+
+export default JSONOptionsForm;
diff --git a/src/openforms/registrations/contrib/new_plugin/__init__.py b/src/openforms/registrations/contrib/new_plugin/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/openforms/registrations/contrib/new_plugin/apps.py b/src/openforms/registrations/contrib/new_plugin/apps.py
new file mode 100644
index 0000000000..70b007c941
--- /dev/null
+++ b/src/openforms/registrations/contrib/new_plugin/apps.py
@@ -0,0 +1,12 @@
+from django.apps import AppConfig
+from django.utils.translation import gettext_lazy as _
+
+
+# TODO-4908: come up with good name: 'JSON' or '(Form) Variables API'?
+class NewPluginConfig(AppConfig):
+    name = "openforms.registrations.contrib.new_plugin"
+    label = "registrations_new_plugin"
+    verbose_name = _("New plugin")
+
+    def ready(self):
+        from . import plugin  # noqa
diff --git a/src/openforms/registrations/contrib/new_plugin/config.py b/src/openforms/registrations/contrib/new_plugin/config.py
new file mode 100644
index 0000000000..48d26487fa
--- /dev/null
+++ b/src/openforms/registrations/contrib/new_plugin/config.py
@@ -0,0 +1,33 @@
+from django.utils.translation import gettext_lazy as _
+
+from rest_framework import serializers
+from zgw_consumers.models import Service
+
+from openforms.api.fields import PrimaryKeyRelatedAsChoicesField
+from openforms.formio.api.fields import FormioVariableKeyField
+from openforms.utils.mixins import JsonSchemaSerializerMixin
+
+
+class NewPluginOptionsSerializer(JsonSchemaSerializerMixin, serializers.Serializer):
+    # TODO-4098: is service enough, or do we need an API group like the ObjectsAPI?
+    service = PrimaryKeyRelatedAsChoicesField(
+        queryset=Service.objects.all(),
+        label=_("Service"),
+        help_text=_("Which service to use."),
+    )
+    # TODO-4098: show the complete API endpoint as a (tooltip) hint after user entry?
+    api_endpoint = serializers.CharField(
+        max_length=255,
+        label=_("Relative API endpoint"),
+        help_text=_("The API endpoint to send the data to (relative to the service API root)."),
+    )
+    # TODO-4098: should be linked to the checkboxes in the form variable table
+    # TODO-4098: is it possible to have a choices field of variable keys, where you can select them
+    #  from a drop-down list?
+    form_variables = serializers.ListField(
+        child=FormioVariableKeyField(max_length=50),
+        label=_("Form variable key list"),
+        help_text=_(
+            "A comma-separated list of form variables (can also include static variables) to use."
+        )
+    )
diff --git a/src/openforms/registrations/contrib/new_plugin/plugin.py b/src/openforms/registrations/contrib/new_plugin/plugin.py
new file mode 100644
index 0000000000..d729e032da
--- /dev/null
+++ b/src/openforms/registrations/contrib/new_plugin/plugin.py
@@ -0,0 +1,18 @@
+from django.utils.translation import gettext_lazy as _
+
+from openforms.submissions.models import Submission
+from ...base import BasePlugin, OptionsT  # openforms.registrations.base
+from ...registry import register  # openforms.registrations.registry
+from .config import NewPluginOptionsSerializer
+
+
+@register("new_plugin")
+class NewPlugin(BasePlugin):
+    verbose_name = _("New fancy plugin")
+    configuration_options = NewPluginOptionsSerializer
+
+    def register_submission(self, submission: Submission, options: OptionsT) -> None:
+        print(options)
+
+    def check_config(self):
+        pass