Add basic code.

djangocms_verify_vat_number/cms_plugins.py

+from django.urls import include, re_path
+from cms.models.pluginmodel import CMSPlugin
+from cms.plugin_base import CMSPluginBase
+from cms.plugin_pool import plugin_pool
+
+
+@plugin_pool.register_plugin
+class VerifyVatNumberPlugin(CMSPluginBase):
+    model = CMSPlugin
+    render_template = "djangocms_verify_vat_number/plugin.html"
+
+    def get_plugin_urls(self):
+        urlpatterns = [
+            re_path(r'^vvn/', include(('django_verify_vat_number.urls', 'django_verify_vat_number'),
+                    namespace='vvn')),
+        ]
+        return urlpatterns
+
+# document.getElementsByClassName("verify-vat-number-urls")[0].dataset.vat_id_url
+# document.getElementsByClassName("verify-vat-number-urls")[0].dataset.vat_reg_url
+# '/cs/admin/cms/page/plugin/verify_vat_number_plugin/vvn/verify-vat-id-number/'
+# '/cs/admin/cms/page/plugin/verify_vat_number_plugin/vvn/verify-vat-reg-number/'

djangocms_verify_vat_number/static/js/verify.js

+console.log("Module static verify.js.")

djangocms_verify_vat_number/templates/djangocms_verify_vat_number/plugin.html

+{% load staticfiles sekizai_tags %}
+{% addtoblock "js" %}<script type="text/javascript" class="cms-execute-js-to-render cms-trigger-event-document-DOMContentLoaded" src="{% static "djangocms_verify_vat_number/js/verify.js" %}"></script>{% endaddtoblock %}
+<span class="verify-vat-number-urls"
+    data-vat_id_url="{% url "admin:vvn:verify_vat_id_number" %}"
+    data-vat_reg_url="{% url "admin:vvn:verify_vat_reg_number" %}"
+></span>

setup.cfg

+[metadata]
+name = djangocms-verify-vat-number
+version = file:VERSION
+description = DjangoCMS Verify VAT number by ARES/VIES
+long_description = file: README.md
+long_description_content_type = text/markdown
+license = GPLv3+
+author = Zdeněk Böhm
+author_email = zdenek.bohm@nic.cz
+classifiers =
+    Typing :: Typed
+    Programming Language :: Python
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Framework :: Django CMS :: 3.7
+
+[options]
+zip_safe = false
+python_requires = ~=3.8
+packages = find:
+include_package_data = true
+install_requires =
+    django-verify-vat-number ~= 1.0
+    django-cms >= 3.7.4
+setup_requires =
+    babel
+
+[options.extras_require]
+quality =
+    doc8
+    flake8
+    isort
+    mypy
+    pydocstyle
+test =
+    responses
+types =
+    types-requests
+
+[compile_catalog]
+domain = django
+directory = djangocms_verify_vat_number/locale
+
+[flake8]
+max-line-length = 120
+max-complexity = 15
+
+[mypy]
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+
+[mypy-django_verify_vat_number.tests.*]
+disallow_untyped_defs = false
+
+[mypy-verify_vat_number.*]
+ignore_missing_imports = True
+
+[mypy-django.*]
+ignore_missing_imports = True
+
+[mypy-appsettings.*]
+ignore_missing_imports = True
+
+[mypy-pycountry.*]
+ignore_missing_imports = True
+
+[isort]
+line_length = 120
+known_first_party = djangocms_verify_vat_number
+known_third_party =
+    django_verify_vat_number
+    verify_vat_number
+combine_as_imports = true
+
+[pydocstyle]
+add_select = D204,D400,D401
+add_ignore = D105,D106,D107
+match_dir = (?!migrations|\.).*
+
+[doc8]
+max-line-length = 120
+allow-long-titles = true

setup.py

+from distutils.command.build import build
+
+from setuptools import setup
+
+
+class custom_build(build):
+    sub_commands = [('compile_catalog', lambda x: True)] + build.sub_commands
+
+
+setup(cmdclass={'build': custom_build})