diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..7da1f96
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 100
diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
new file mode 100644
index 0000000..9ded3e0
--- /dev/null
+++ b/.github/workflows/docs.yaml
@@ -0,0 +1,37 @@
+name: Deploy docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  docs:
+    name: Deploy docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.10.x"
+
+      - name: Upgrade pip
+        run: |
+          pip install -U pip poetry
+
+      - name: Install package and doc dependencies
+        run: |
+          poetry install
+
+      - name: Generate docs
+        run: |
+          poetry run docs
+
+      - name: Deploy docs
+        uses: JamesIves/github-pages-deploy-action@v4.2.3
+        with:
+          branch: gh-pages
+          folder: docs/fhir_utils
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
new file mode 100644
index 0000000..0e7ee46
--- /dev/null
+++ b/.github/workflows/lint.yaml
@@ -0,0 +1,35 @@
+name: CI - Lint
+
+on:
+  push:
+
+jobs:
+  lint:
+    name: ${{ matrix.os }}${{ matrix.arch }} - Python ${{ matrix.python-version }} - lint
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        arch: [x64]
+        python-version: ["3.10.x"]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: ${{ matrix.arch }}
+
+      - name: Set up Poetry and upgrade pip
+        run: |
+          pip install -U pip poetry
+
+      - name: Install this package
+        run: |
+          poetry install
+
+      - name: Run tests
+        run: |
+          poetry run lint
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
new file mode 100644
index 0000000..978fa3a
--- /dev/null
+++ b/.github/workflows/tests.yaml
@@ -0,0 +1,35 @@
+name: CI - Tests
+
+on:
+  push:
+
+jobs:
+  tests:
+    name: ${{ matrix.os }}${{ matrix.arch }} - Python ${{ matrix.python-version }} - tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        arch: [x64]
+        python-version: ["3.10.x"]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: ${{ matrix.arch }}
+
+      - name: Set up Poetry and upgrade pip
+        run: |
+          pip install -U pip poetry
+
+      - name: Install this package
+        run: |
+          poetry install
+
+      - name: Run tests
+        run: |
+          poetry run test
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f7c807f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,132 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# VS Code
+.vscode/
\ No newline at end of file
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..8cdc530
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,20 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.2.0
+    hooks:
+    - id: check-added-large-files # prevents adding large files
+    - id: detect-private-key # detects private keys
+    - id: fix-byte-order-marker # fixes BOM
+    - id: fix-encoding-pragma # fixes encoding pragma
+    - id: no-commit-to-branch # prevents committing to protected branches
+    - id: trailing-whitespace # prevents trailing whitespace
+-   repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+    -   id: black
+        language_version: python3.10
+        exclude: 'pipelines\/\{\{cookiecutter\.project_name\}\}.*'
+-   repo: https://github.com/PyCQA/flake8
+    rev: 4.0.1
+    hooks:
+    - id: flake8
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
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+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
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+  You may convey verbatim copies of the Program's source code as you
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+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
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+organization, or merging organizations.  If propagation of a covered
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+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
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+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
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+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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.
+
+    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..537e86d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,17 @@
+# FHIR utilities
+
+This repository contains a set of utilities for working with FHIR resources.
+
+## Installation
+
+```bash
+pip install fhir-utils
+```
+
+## Development
+
+```bash
+git clone https://github.com/prefeitura-rio/fhir-utils
+cd fhir-utils
+poetry install
+```
diff --git a/fhir_utils/__init__.py b/fhir_utils/__init__.py
new file mode 100644
index 0000000..45ba86e
--- /dev/null
+++ b/fhir_utils/__init__.py
@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+from .conf import settings  # noqa
+from .version import __version__  # noqa
diff --git a/fhir_utils/conf.py b/fhir_utils/conf.py
new file mode 100644
index 0000000..b59b552
--- /dev/null
+++ b/fhir_utils/conf.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+from os import getenv
+from typing import Callable, Union
+
+from loguru import logger
+
+
+def getenv_or_action(
+    key: str, action: Union[Callable[[str], str], str], default: str = None
+) -> str:
+    """
+    Get an environment variable or execute an action.
+
+    Args:
+        key (str): The name of the environment variable.
+        action (Union[Callable[[str], str], str]): The action to execute if the
+            environment variable is not set. Can be a callable or a string. If a
+            callable is provided, it will be called with the key as the only
+            argument. If a string is provided, it will check if this callback
+            is implemented here and call it. If not, it will raise an exception.
+        default (str, optional): The default value to return if the environment
+            variable is not set and no action is provided. Defaults to None.
+
+    Returns:
+        str: The value of the environment variable or the result of the action.
+    """
+
+    def _raise(key: str) -> str:
+        raise Exception(
+            f"Environment variable {key} is not set and no action is provided."
+        )
+
+    def _warn(key: str) -> str:
+        logger.warning(f"Environment variable {key} is not set. Using default value.")
+        return default
+
+    def _pass(key: str) -> str:
+        return default
+
+    _val = getenv(key)
+    if _val is None:
+        if action in [None, "pass"]:
+            return _pass(key)
+        elif callable(action):
+            return action(key)
+        elif isinstance(action, str):
+            if action == "raise":
+                return _raise(key)
+            elif action == "warn":
+                return _warn(key)
+            else:
+                raise ValueError(
+                    f'Action "{action}" is not implemented in getenv_or_action.'
+                )
+        else:
+            return default
+    return _val
+
+
+class Settings:
+    __slots__ = ()
+
+
+settings = Settings()
diff --git a/fhir_utils/version.py b/fhir_utils/version.py
new file mode 100644
index 0000000..2ad579c
--- /dev/null
+++ b/fhir_utils/version.py
@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+import importlib.metadata
+
+__version__ = importlib.metadata.version("fhir_utils")
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..a0a3598
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,539 @@
+# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
+
+[[package]]
+name = "black"
+version = "22.12.0"
+description = "The uncompromising code formatter."
+optional = false
+python-versions = ">=3.7"
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+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
+
+[package.extras]
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+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
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+version = "3.3.1"
+description = "Validate configuration and produce human readable error messages."
+optional = false
+python-versions = ">=3.6.1"
+files = [
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+[[package]]
+name = "click"
+version = "8.1.4"
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+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
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+name = "coverage"
+version = "7.2.7"
+description = "Code coverage measurement for Python"
+optional = false
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+
+[[package]]
+name = "win32-setctime"
+version = "1.1.0"
+description = "A small Python utility to set file creation time on Windows"
+optional = false
+python-versions = ">=3.5"
+files = [
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+]
+
+[package.extras]
+dev = ["black (>=19.3b0)", "pytest (>=4.6.2)"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "a3772af84afdf76d847108ea4ba1a07e8f1528362c3c53c602cf3321e05d80d9"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..493aa20
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,30 @@
+[tool.poetry]
+name = "fhir-utils"
+version = "0.0.1a0"
+description = "Utilities for handling FHIR data."
+authors = ["Escritório de Dados <escritoriodedados@gmail.com>"]
+license = "GPL-3.0-only"
+readme = "README.md"
+homepage = "https://github.com/prefeitura-rio/fhir-utils"
+repository = "https://github.com/prefeitura-rio/fhir-utils"
+keywords = ["fhir", "utilities", "data", "health", "government"]
+
+[tool.poetry.dependencies]
+python = "^3.10"
+loguru = ">=0.6"
+
+[tool.poetry.dev-dependencies]
+black = "^22.3.0"
+pre-commit = "^2.18.1"
+pytest-cov = "^3.0.0"
+flake8 = "^4.0.1"
+pdoc3 = "^0.10.0"
+
+[tool.poetry.scripts]
+docs = "scripts.docs:main"
+lint = "scripts.lint:main"
+test = "scripts.test:main"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..77409e9
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,9 @@
+[pytest]
+testpaths =
+    tests
+norecursedirs=dist build .tox scripts
+addopts =
+    --doctest-modules
+    --cov=fhir_utils
+    -r a
+    -v
diff --git a/scripts/__init__.py b/scripts/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/scripts/docs.py b/scripts/docs.py
new file mode 100644
index 0000000..ce36515
--- /dev/null
+++ b/scripts/docs.py
@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+import subprocess
+
+
+def main():
+    """
+    Lint all python files in the project.
+    """
+    command = "pdoc3 --html --html-dir docs fhir_utils"
+    subprocess.run(command, shell=True)
diff --git a/scripts/lint.py b/scripts/lint.py
new file mode 100644
index 0000000..c3bf29f
--- /dev/null
+++ b/scripts/lint.py
@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+from glob import glob
+import subprocess
+
+
+def main():
+    """
+    Lint all python files in the project.
+    """
+    files = glob("**/*.py", recursive=True)
+    subprocess.run(["flake8", *files])
diff --git a/scripts/test.py b/scripts/test.py
new file mode 100644
index 0000000..b2203d0
--- /dev/null
+++ b/scripts/test.py
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+import pytest
+
+
+def main():
+    pytest.main([])
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_sanity.py b/tests/test_sanity.py
new file mode 100644
index 0000000..7fcfa18
--- /dev/null
+++ b/tests/test_sanity.py
@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+def test_sanity():
+    assert True