Add example of third party API

app/third_party/app/__init__.py

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+def create_bp(env=None):
+    from flask import Blueprint, jsonify
+    from flask_sqlalchemy import SQLAlchemy
+    from flask_restplus import Api, Resource, Namespace
+
+    bp = Blueprint('Example third party API', __name__)
+    api = Api(bp, title='Flaskerific API', version='0.1.0')
+    ns = Namespace('Third party hello world API')
+    @ns.route('/')
+    class ExampleResource(Resource):
+        def get(self):
+            return "I'm a third party API!"
+    api.add_namespace(ns, path='/hello_world')
+    return bp

app/third_party/app/config.py

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+import os
+from typing import List, Type
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+
+class BaseConfig:
+    CONFIG_NAME = 'base'
+    USE_MOCK_EQUIVALENCY = False
+    DEBUG = False
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+
+
+class DevelopmentConfig(BaseConfig):
+    CONFIG_NAME = 'dev'
+    SECRET_KEY = os.getenv(
+        "DEV_SECRET_KEY", "You can't see California without Marlon Widgeto's eyes")
+    DEBUG = True
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    TESTING = False
+    SQLALCHEMY_DATABASE_URI = "sqlite:///{0}/app-dev.db".format(basedir)
+
+
+class TestingConfig(BaseConfig):
+    CONFIG_NAME = 'test'
+    SECRET_KEY = os.getenv("TEST_SECRET_KEY", "Thanos did nothing wrong")
+    DEBUG = True
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    TESTING = True
+    SQLALCHEMY_DATABASE_URI = "sqlite:///{0}/app-test.db".format(basedir)
+
+
+class ProductionConfig(BaseConfig):
+    CONFIG_NAME = 'prod'
+    SECRET_KEY = os.getenv("PROD_SECRET_KEY", "I'm Ron Burgundy?")
+    DEBUG = False
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    TESTING = False
+    SQLALCHEMY_DATABASE_URI = "sqlite:///{0}/app-prod.db".format(basedir)
+
+
+EXPORT_CONFIGS: List[Type[BaseConfig]] = [
+    DevelopmentConfig, TestingConfig, ProductionConfig]
+config_by_name = {cfg.CONFIG_NAME: cfg for cfg in EXPORT_CONFIGS}

app/third_party/app/routes.py

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+def register_routes(api, app, root='api'):
+    from app.widget import register_routes as attach_widget
+    from app.fizz import register_routes as attach_fizz
+    from app.other_api import register_routes as attach_other_api
+
+    # Add routes
+    attach_widget(api, app)
+    attach_fizz(api, app)
+    attach_other_api(api, app)