diff --git a/.gitignore b/.gitignore
index f69dfd5..d6b84d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1 @@
-*~
-*.pyc
-dist/
 rattail_mailchimp.egg-info/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9009e56..7fc0322 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,46 +5,6 @@ All notable changes to rattail-mailchimp will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## v0.3.3 (2024-07-05)
-
-### Fix
-
-- define `host_key` for MailChimp -> Rattail import
-
-## v0.3.2 (2024-07-01)
-
-### Fix
-
-- remove legacy command definitions
-
-## v0.3.1 (2024-06-14)
-
-### Fix
-
-- fallback to `importlib_metadata` on older python
-
-## v0.3.0 (2024-06-10)
-
-### Feat
-
-- switch from setup.cfg to pyproject.toml + hatchling
-
-## [0.2.1] - 2024-06-04
-### Changed
-- Setup default handler for Mailchimp -> Rattail import.
-
-## [0.2.0] - 2024-06-03
-### Changed
-- Migrate all commands to use `typer`.
-
-## [0.1.5] - 2023-11-30
-### Changed
-- Update subcommand entry point group names, per wuttjamaican.
-
-## [0.1.4] - 2023-06-01
-### Changed
-- Replace `setup.py` contents with `setup.cfg`.
-
 ## [0.1.3] - 2023-05-13
 ### Changed
 - Avoid deprecated import for `OrderedDict`.
diff --git a/README.md b/README.md
deleted file mode 100644
index 5b17139..0000000
--- a/README.md
+++ /dev/null
@@ -1,11 +0,0 @@
-
-# rattail_mailchimp
-
-Rattail is a retail software framework, released under the GNU General
-Public License.
-
-This package contains software interfaces for the
-[MailChimp](https://mailchimp.com/) system.
-
-Please see the [Rattail Project](https://rattailproject.org/) for more
-information.
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..25dc9c3
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,14 @@
+
+rattail_mailchimp
+=================
+
+Rattail is a retail software framework, released under the GNU General
+Public License.
+
+This package contains software interfaces for the `MailChimp`_ system.
+
+.. _`MailChimp`: https://mailchimp.com/
+
+Please see the `Rattail Project`_ for more information.
+
+.. _`Rattail Project`: https://rattailproject.org/
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 335d26c..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,54 +0,0 @@
-
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
-
-
-[project]
-name = "rattail-mailchimp"
-version = "0.3.3"
-description = "Rattail Software Interfaces for MailChimp"
-readme = "README.md"
-authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
-license = {text = "GNU GPL v3+"}
-classifiers = [
-        "Development Status :: 4 - Beta",
-        "Environment :: Console",
-        "Environment :: Web Environment",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
-        "Natural Language :: English",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Topic :: Office/Business",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-]
-dependencies = [
-        "mailchimp3",
-        "rattail",
-]
-
-
-[project.entry-points."rattail.config.extensions"]
-rattail_mailchimp = "rattail_mailchimp.config:MailchimpConfigExtension"
-
-
-[project.entry-points."rattail.typer_imports"]
-rattail_mailchimp = "rattail_mailchimp.commands"
-
-
-[project.entry-points."rattail.emails"]
-rattail_mailchimp = "rattail_mailchimp.emails"
-
-
-[project.urls]
-Homepage = "https://rattailproject.org"
-Repository = "https://kallithea.rattailproject.org/rattail-project/rattail-mailchimp"
-Changelog = "https://kallithea.rattailproject.org/rattail-project/rattail-mailchimp/files/master/CHANGELOG.md"
-
-
-[tool.commitizen]
-version_provider = "pep621"
-tag_format = "v$version"
-update_changelog_on_bump = true
diff --git a/rattail_mailchimp/_version.py b/rattail_mailchimp/_version.py
index 1c2e56d..d60824a 100644
--- a/rattail_mailchimp/_version.py
+++ b/rattail_mailchimp/_version.py
@@ -1,9 +1,3 @@
 # -*- coding: utf-8; -*-
 
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version
-
-
-__version__ = version('rattail-mailchimp')
+__version__ = '0.1.3'
diff --git a/rattail_mailchimp/commands.py b/rattail_mailchimp/commands.py
index bc3bdef..8808fbb 100644
--- a/rattail_mailchimp/commands.py
+++ b/rattail_mailchimp/commands.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2021 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,25 +24,23 @@
 Rattail Commands for MailChimp integration
 """
 
-import typer
-
-from rattail.commands import rattail_typer
-from rattail.commands.typer import importer_command, typer_get_runas_user
-from rattail.commands.importing import ImportCommandHandler
+from rattail import commands
+from rattail.util import load_object
 
 
-@rattail_typer.command()
-@importer_command
-def import_mailchimp(
-        ctx: typer.Context,
-        **kwargs
-):
+class ImportMailChimp(commands.ImportSubcommand):
     """
     Import data to Rattail, from MailChimp API
     """
-    config = ctx.parent.rattail_config
-    progress = ctx.parent.rattail_progress
-    handler = ImportCommandHandler(
-        config, import_handler_key='to_rattail.from_mailchimp.import')
-    kwargs['user'] = typer_get_runas_user(ctx)
-    handler.run(kwargs, progress=progress)
+    name = 'import-mailchimp'
+    description = __doc__.strip()
+    default_handler_spec = 'rattail_mailchimp.importing.mailchimp:FromMailChimpToRattail'
+
+    def get_handler_factory(self, **kwargs):
+        if self.config:
+            spec = self.config.get('rattail.importing', 'mailchimp.handler',
+                                   default=self.default_handler_spec)
+        else:
+            # just use default, for sake of cmd line help
+            spec = self.default_handler_spec
+        return load_object(spec)
diff --git a/rattail_mailchimp/config.py b/rattail_mailchimp/config.py
deleted file mode 100644
index 4bad837..0000000
--- a/rattail_mailchimp/config.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
-#
-#  This file is part of Rattail.
-#
-#  Rattail is free software: you can redistribute it and/or modify it under the
-#  terms of the GNU General Public License as published by the Free Software
-#  Foundation, either version 3 of the License, or (at your option) any later
-#  version.
-#
-#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Config extensions for rattail-mailchimp
-"""
-
-from wuttjamaican.conf import WuttaConfigExtension
-
-
-class MailchimpConfigExtension(WuttaConfigExtension):
-    """
-    Config extension for rattail-mailchimp
-    """
-    key = 'rattail_mailchimp'
-
-    def configure(self, config):
-
-        # rattail import-mailchimp
-        config.setdefault('rattail.importing', 'to_rattail.from_mailchimp.import.default_handler',
-                          'rattail_mailchimp.importing.mailchimp:FromMailChimpToRattail')
-        config.setdefault('rattail.importing', 'to_rattail.from_mailchimp.import.default_cmd',
-                          'rattail import-mailchimp')
diff --git a/rattail_mailchimp/importing/mailchimp.py b/rattail_mailchimp/importing/mailchimp.py
index c5f9a35..6c194fb 100644
--- a/rattail_mailchimp/importing/mailchimp.py
+++ b/rattail_mailchimp/importing/mailchimp.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2023 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -30,6 +30,7 @@ from collections import OrderedDict
 from mailchimp3 import MailChimp
 
 from rattail import importing
+from rattail.time import localtime, make_utc
 from rattail_mailchimp import importing as mailchimp_importing
 
 
@@ -37,9 +38,7 @@ class FromMailChimpToRattail(importing.ToRattailHandler):
     """
     Handler for MailChimp -> Rattail cache import
     """
-    host_key = 'mailchimp'
     host_title = "MailChimp"
-    generic_host_title = "MailChimp"
     
     def get_importers(self):
         importers = OrderedDict()
@@ -54,7 +53,7 @@ class FromMailChimp(importing.Importer):
     """
 
     def setup(self):
-        super().setup()
+        super(FromMailChimp, self).setup()
 
         self.api_key = self.config.require('mailchimp', 'api_key')
         self.mailchimp = MailChimp(self.api_key)
@@ -66,10 +65,10 @@ class FromMailChimp(importing.Importer):
             # issue..since we clearly have a UTC value
             value = value[:-6]
             dt = datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S')
-            dt = self.app.localtime(dt, from_utc=True)
+            dt = localtime(self.config, dt, from_utc=True)
         else:
             dt = datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S%z')
-            dt = self.app.localtime(dt)
+            dt = localtime(self.config, dt)
         return dt
 
 
@@ -96,7 +95,7 @@ class MailChimpListImporter(FromMailChimp, mailchimp_importing.model.MailChimpLi
         return {
             'id': mclist['id'],
             'name': mclist['name'],
-            'date_created': self.app.make_utc(date_created),
+            'date_created': make_utc(date_created),
         }
 
 
@@ -161,6 +160,6 @@ class MailChimpListMemberImporter(FromMailChimp, mailchimp_importing.model.MailC
             'status': member['status'],
             # TODO: this API endpoint does not appear to include this field?
             # 'unsubscribe_reason': member.get('unsubscribe_reason'),
-            'last_changed': self.app.make_utc(last_changed),
+            'last_changed': make_utc(last_changed),
             'source': member['source'],
         }
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..7235ac6
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,107 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2022 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+
+import os
+from setuptools import setup, find_packages
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+exec(open(os.path.join(here, 'rattail_mailchimp', '_version.py')).read())
+README = open(os.path.join(here, 'README.rst')).read()
+
+
+requires = [
+    #
+    # Version numbers within comments below have specific meanings.
+    # Basically the 'low' value is a "soft low," and 'high' a "soft high."
+    # In other words:
+    #
+    # If either a 'low' or 'high' value exists, the primary point to be
+    # made about the value is that it represents the most current (stable)
+    # version available for the package (assuming typical public access
+    # methods) whenever this project was started and/or documented.
+    # Therefore:
+    #
+    # If a 'low' version is present, you should know that attempts to use
+    # versions of the package significantly older than the 'low' version
+    # may not yield happy results.  (A "hard" high limit may or may not be
+    # indicated by a true version requirement.)
+    #
+    # Similarly, if a 'high' version is present, and especially if this
+    # project has laid dormant for a while, you may need to refactor a bit
+    # when attempting to support a more recent version of the package.  (A
+    # "hard" low limit should be indicated by a true version requirement
+    # when a 'high' version is present.)
+    #
+    # In any case, developers and other users are encouraged to play
+    # outside the lines with regard to these soft limits.  If bugs are
+    # encountered then they should be filed as such.
+    #
+    # package                           # low                   high
+
+    'mailchimp3',                       # 3.0.14
+    'rattail',                          # 0.9.214
+]
+
+
+setup(
+    name = "rattail-mailchimp",
+    version = __version__,
+    author = "Lance Edgar",
+    author_email = "lance@edbob.org",
+    url = "https://rattailproject.org/",
+    license = "GNU GPL v3",
+    description = "Rattail Software Interfaces for MailChimp",
+    long_description = README,
+
+    classifiers = [
+        'Development Status :: 4 - Beta',
+        'Environment :: Console',
+        'Environment :: Web Environment',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+        'Natural Language :: English',
+        'Operating System :: OS Independent',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 3',
+        'Topic :: Office/Business',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+    ],
+
+    install_requires = requires,
+    packages = find_packages(),
+    include_package_data = True,
+    zip_safe = False,
+
+    entry_points = {
+
+        'rattail.commands': [
+            'import-mailchimp = rattail_mailchimp.commands:ImportMailChimp',
+        ],
+
+
+        'rattail.emails': [
+            'rattail_mailchimp = rattail_mailchimp.emails',
+        ],
+    },
+)
diff --git a/tasks.py b/tasks.py
index 912f111..ac9fab3 100644
--- a/tasks.py
+++ b/tasks.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2022 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -30,15 +30,17 @@ import shutil
 from invoke import task
 
 
+here = os.path.abspath(os.path.dirname(__file__))
+exec(open(os.path.join(here, 'rattail_mailchimp', '_version.py')).read())
+
+
 @task
-def release(c):
+def release(ctx):
     """
     Release a new version of 'rattail-mailchimp'.
     """
-    if os.path.exists('dist'):
-        shutil.rmtree('dist')
-    if os.path.exists('rattail_mailchimp.egg-info'):
-        shutil.rmtree('rattail_mailchimp.egg-info')
-    c.run('python -m build --sdist')
+    shutil.rmtree('rattail_mailchimp.egg-info')
+    ctx.run('python -m build --sdist')
 
-    c.run('twine upload dist/*')
+    filename = 'rattail-mailchimp-{}.tar.gz'.format(__version__)
+    ctx.run('twine upload dist/{}'.format(filename))