Code for step 1

Author: akoutmos

.formatter.exs

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+# Used by "mix format"
+[
+  line_length: 120,
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+payments_client-*.tar
+

README.md

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+# PaymentsClient
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `payments_client` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:payments_client, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/payments_client](https://hexdocs.pm/payments_client).
+

lib/mock_api.ex

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+defmodule PaymentsClient.MockAPI do
+  def create_payment(user_id, new_payment_info) do
+    Process.sleep(random_latency())
+
+    %{
+      status: 201,
+      user_id: user_id,
+      payment: new_payment_info
+    }
+  end
+
+  # Do something with the resp here
+  def handle_create_payment(_resp), do: nil
+
+  def delete_payment(user_id, payment_id) do
+    Process.sleep(random_latency())
+
+    %{
+      status: 204,
+      user_id: user_id,
+      id: payment_id
+    }
+  end
+
+  # Do something with the resp here
+  def handle_delete_payment(_resp), do: nil
+
+  def charge_payment(user_id, payment_id, amount) do
+    Process.sleep(random_latency())
+
+    %{
+      status: 200,
+      user_id: user_id,
+      amount: amount,
+      id: payment_id,
+      payment_processed: Enum.random(~w(success failed))
+    }
+  end
+
+  # Do something with the resp here
+  def handle_charge_payment(_resp), do: nil
+
+  defp random_latency do
+    Enum.random(100..400)
+  end
+end

lib/payments_client.ex

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+defmodule PaymentsClient do
+  @moduledoc """
+  Documentation for PaymentsClient.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> PaymentsClient.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

lib/payments_client/application.ex

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+defmodule PaymentsClient.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  def start(_type, _args) do
+    children = [
+      # Starts a worker by calling: PaymentsClient.Worker.start_link(arg)
+      # {PaymentsClient.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: PaymentsClient.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end

mix.exs

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+defmodule PaymentsClient.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :payments_client,
+      version: "0.1.0",
+      elixir: "~> 1.9",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger],
+      mod: {PaymentsClient.Application, []}
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

test/payments_client_test.exs

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+defmodule PaymentsClientTest do
+  use ExUnit.Case
+  doctest PaymentsClient
+
+  test "greets the world" do
+    assert PaymentsClient.hello() == :world
+  end
+end

test/test_helper.exs

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+ExUnit.start()